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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized cost within one year	$ 10,054	$ 13,347
Amortized cost one to five years	29,238	40,468
Amortized cost for five to ten years	80,973	50,473
Amortized cost for after ten years	46,846	63,306
Total amortized cost	167,111	167,594
Total available for sale investment securities, Amortized Cost	539,086	513,602
Within one year, amortized cost	5,578	1,948
One to five years, amortized cost	43,825	40,603
Five to ten years, amortized cost	103,804	89,801
After ten years, amortized cost	36,872	47,484
Total amortized cost	190,079	179,836
Total held to maturity investment securities, amortized cost	209,767	200,448
Fair value within one year	10,013	13,326
Fair value for one to five years	28,739	40,193
Fair value for five to ten years	79,937	51,156
Fair value for after ten years	46,377	64,326
Total fair value	165,066	169,001
Investment securities, available for sale	526,195	509,665
Within one year, fair value	5,546	1,934
One to five years, fair value	44,383	41,531
five to ten years, fair value	103,252	91,249
After ten years, fair value	34,199	45,683
Total fair value	187,380	180,397
Held-to-maturity, Fair Value	206,730	201,085
Federal Agency Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	168,382	132,871
Total held to maturity investment securities, amortized cost	5,409	5,734
Investment securities, available for sale	164,134	130,365
Held-to-maturity, Fair Value	5,260	5,682
Federal Agency Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	203,593	211,487
Total held to maturity investment securities, amortized cost	14,279	14,878
Investment securities, available for sale	196,995	208,657
Held-to-maturity, Fair Value	$ 14,090	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
-SubTopic 10
-Section 50
-Paragraph 2
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