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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, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 40,283	$ 20,532
Amortized cost one to five years	41,593	42,476
Amortized cost for five to ten years	102,753	107,839
Amortized cost for after ten years	180,240	67,020
Total amortized cost	364,869	237,867
Total available for sale investment securities, Amortized Cost	753,115	608,909
Within one year, amortized cost	6,413	70
One to five years, amortized cost	54,558	48,732
Five to ten years, amortized cost	98,134	101,809
After ten years, amortized cost	33,631	40,658
Total amortized cost	192,736	191,269
Total held to maturity investment securities, amortized cost	210,306	210,112
Fair value within one year	40,168	20,448
Fair value for one to five years	41,671	41,705
Fair value for five to ten years	107,719	107,107
Fair value for after ten years	185,992	67,349
Total fair value	375,550	236,609
Investment securities, available for sale	767,230	600,348
Within one year, fair value	6,479	70
One to five years, fair value	55,545	49,324
five to ten years, fair value	101,776	101,533
After ten years, fair value	36,172	38,749
Total fair value	199,972	189,676
Held-to-maturity, Fair Value	217,718	208,273
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	243,366	187,563
Total held to maturity investment securities, amortized cost	4,714	5,144
Investment securities, available for sale	246,083	185,003
Held-to-maturity, Fair Value	4,716	5,030
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	144,880	183,479
Total held to maturity investment securities, amortized cost	12,856	13,699
Investment securities, available for sale	145,597	178,736
Held-to-maturity, Fair Value	$ 13,030	$ 13,567

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Section 50
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