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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized cost within one year	$ 19,958	$ 13,347
Amortized cost one to five years	34,822	40,468
Amortized cost for five to ten years	96,035	50,473
Amortized cost for after ten years	36,441	63,306
Total amortized cost	187,256	167,594
Total available for sale investment securities, Amortized Cost	558,786	513,602
Within one year, amortized cost	5,646	1,948
One to five years, amortized cost	48,383	40,603
Five to ten years, amortized cost	102,816	89,801
After ten years, amortized cost	47,774	47,484
Total amortized cost	204,619	179,836
Total held to maturity investment securities, amortized cost	223,848	200,448
Fair value within one year	19,861	13,326
Fair value for one to five years	34,019	40,193
Fair value for five to ten years	94,103	51,156
Fair value for after ten years	35,676	64,326
Total fair value	183,659	169,001
Investment securities, available for sale	542,305	509,665
Within one year, fair value	5,628	1,934
One to five years, fair value	48,788	41,531
five to ten years, fair value	101,199	91,249
After ten years, fair value	44,809	45,683
Total fair value	200,424	180,397
Held-to-maturity, Fair Value	219,158	201,085
Federal Agency Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	178,069	132,871
Total held to maturity investment securities, amortized cost	5,262	5,734
Investment securities, available for sale	172,671	130,365
Held-to-maturity, Fair Value	5,083	5,682
Federal Agency Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	193,461	211,487
Total held to maturity investment securities, amortized cost	13,967	14,878
Investment securities, available for sale	185,975	208,657
Held-to-maturity, Fair Value	$ 13,651	15,006
Private Labeled Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost		1,650
Investment securities, available for sale		$ 1,642

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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