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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, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 26,850	$ 20,532
Amortized cost one to five years	40,560	42,476
Amortized cost for five to ten years	88,574	107,839
Amortized cost for after ten years	124,740	67,020
Total amortized cost	280,724	237,867
Total available for sale investment securities, Amortized Cost	663,268	608,909
Within one year, amortized cost	2,481	70
One to five years, amortized cost	56,121	48,732
Five to ten years, amortized cost	101,195	101,809
After ten years, amortized cost	35,922	40,658
Total amortized cost	195,719	191,269
Total held to maturity investment securities, amortized cost	213,768	210,112
Fair value within one year	26,836	20,448
Fair value for one to five years	40,333	41,705
Fair value for five to ten years	92,128	107,107
Fair value for after ten years	129,077	67,349
Total fair value	288,374	236,609
Investment securities, available for sale	673,419	600,348
Within one year, fair value	2,499	70
One to five years, fair value	57,124	49,324
five to ten years, fair value	104,168	101,533
After ten years, fair value	37,904	38,749
Total fair value	201,695	189,676
Held-to-maturity, Fair Value	219,891	208,273
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	229,166	187,563
Total held to maturity investment securities, amortized cost	4,884	5,144
Investment securities, available for sale	231,522	185,003
Held-to-maturity, Fair Value	4,877	5,030
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	153,378	183,479
Total held to maturity investment securities, amortized cost	13,165	13,699
Investment securities, available for sale	153,523	178,736
Held-to-maturity, Fair Value	$ 13,319	$ 13,567

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