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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 20,532	$ 13,347
Amortized cost one to five years	42,476	40,468
Amortized cost for five to ten years	107,839	50,473
Amortized cost for after ten years	67,020	63,306
Total amortized cost	237,867	167,594
Total available for sale investment securities, Amortized Cost	608,909	513,602
Within one year, amortized cost	70	1,948
One to five years, amortized cost	48,732	40,603
Five to ten years, amortized cost	101,809	89,801
After ten years, amortized cost	40,658	47,484
Total amortized cost	191,269	179,836
Total held to maturity investment securities, amortized cost	210,112	200,448
Fair value within one year	20,448	13,326
Fair value for one to five years	41,705	40,193
Fair value for five to ten years	107,107	51,156
Fair value for after ten years	67,349	64,326
Total fair value	236,609	169,001
Investment securities, available for sale	600,348	509,665
Within one year, fair value	70	1,934
One to five years, fair value	49,324	41,531
five to ten years, fair value	101,533	91,249
After ten years, fair value	38,749	45,683
Total fair value	189,676	180,397
Held-to-maturity, Fair Value	208,273	201,085
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	187,563	132,871
Total held to maturity investment securities, amortized cost	5,144	5,734
Investment securities, available for sale	185,003	130,365
Held-to-maturity, Fair Value	5,030	5,682
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	183,479	211,487
Total held to maturity investment securities, amortized cost	13,699	14,878
Investment securities, available for sale	178,736	208,657
Held-to-maturity, Fair Value	$ 13,567	15,006
Private Labeled Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost		1,650
Investment securities, available for sale		$ 1,642

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