Securities Available For Sale - Fair Value of Securities with Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair value of securities with unrealized losses, aggregated by investment category and length of time
Continuing Unrealized Loss For Less Than 12 Months Fair Value	$ 5,086	$ 33,342
Continuing Unrealized Loss For Less Than 12 Months, Unrealized Loss	(36)	(269)
Continuing Unrealized Loss For 12 Months or More Fair Value	17,428	20,752
Continuing Unrealized Loss For 12 Months or More, Unrealized Loss	(237)	(632)
Total Fair Value	22,514	54,094
Total Unrealized Loss	(273)	(901)
U.S. federal agency obligations [Member]
Fair value of securities with unrealized losses, aggregated by investment category and length of time
Continuing Unrealized Loss For Less Than 12 Months Fair Value	1,099	8,371
Continuing Unrealized Loss For Less Than 12 Months, Unrealized Loss	(1)	(71)
Continuing Unrealized Loss For 12 Months or More Fair Value	0	0
Continuing Unrealized Loss For 12 Months or More, Unrealized Loss	0	0
Total Fair Value	1,099	8,371
Total Unrealized Loss	(1)	(71)
State and municipal [Member]
Fair value of securities with unrealized losses, aggregated by investment category and length of time
Continuing Unrealized Loss For Less Than 12 Months Fair Value		4,512
Continuing Unrealized Loss For Less Than 12 Months, Unrealized Loss		(14)
Continuing Unrealized Loss For 12 Months or More Fair Value		856
Continuing Unrealized Loss For 12 Months or More, Unrealized Loss		(3)
Total Fair Value		5,368
Total Unrealized Loss		(17)
Mortgage-backed securities - residential [Member]
Fair value of securities with unrealized losses, aggregated by investment category and length of time
Continuing Unrealized Loss For Less Than 12 Months Fair Value	900	9,259
Continuing Unrealized Loss For Less Than 12 Months, Unrealized Loss	(3)	(48)
Continuing Unrealized Loss For 12 Months or More Fair Value	813	809
Continuing Unrealized Loss For 12 Months or More, Unrealized Loss	(6)	(25)
Total Fair Value	1,713	10,068
Total Unrealized Loss	(9)	(73)
Government agency sponsored collateralized mortgage obligations [Member]
Fair value of securities with unrealized losses, aggregated by investment category and length of time
Continuing Unrealized Loss For Less Than 12 Months Fair Value	3,087	11,200
Continuing Unrealized Loss For Less Than 12 Months, Unrealized Loss	(32)	(136)
Continuing Unrealized Loss For 12 Months or More Fair Value	15,667	18,148
Continuing Unrealized Loss For 12 Months or More, Unrealized Loss	(179)	(543)
Total Fair Value	18,754	29,348
Total Unrealized Loss	(211)	(679)
Corporate debt securities [Member]
Fair value of securities with unrealized losses, aggregated by investment category and length of time
Continuing Unrealized Loss For Less Than 12 Months Fair Value	0	0
Continuing Unrealized Loss For Less Than 12 Months, Unrealized Loss	0	0
Continuing Unrealized Loss For 12 Months or More Fair Value	948	939
Continuing Unrealized Loss For 12 Months or More, Unrealized Loss	(52)	(61)
Total Fair Value	948	939
Total Unrealized Loss	$ (52)	$ (61)

LaPorte Bancorp, Inc. 10-Q