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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, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 37,386	$ 20,532
Amortized cost one to five years	41,230	42,476
Amortized cost for five to ten years	117,004	107,839
Amortized cost for after ten years	213,574	67,020
Total amortized cost	409,194	237,867
Total available for sale investment securities, Amortized Cost	822,089	608,909
Within one year, amortized cost	7,811	70
One to five years, amortized cost	56,037	48,732
Five to ten years, amortized cost	94,756	101,809
After ten years, amortized cost	32,163	40,658
Total amortized cost	190,767	191,269
Total held to maturity investment securities, amortized cost	207,899	210,112
Fair value within one year	37,321	20,448
Fair value for one to five years	41,293	41,705
Fair value for five to ten years	122,145	107,107
Fair value for after ten years	218,193	67,349
Total fair value	418,952	236,609
Investment securities, available for sale	834,776	600,348
Within one year, fair value	7,874	70
One to five years, fair value	57,048	49,324
five to ten years, fair value	98,480	101,533
After ten years, fair value	34,440	38,749
Total fair value	197,842	189,676
Held-to-maturity, Fair Value	215,147	208,273
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	267,272	187,563
Total held to maturity investment securities, amortized cost	4,560	5,144
Investment securities, available for sale	269,252	185,003
Held-to-maturity, Fair Value	4,568	5,030
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	145,623	183,479
Total held to maturity investment securities, amortized cost	12,572	13,699
Investment securities, available for sale	146,572	178,736
Held-to-maturity, Fair Value	$ 12,737	$ 13,567

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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