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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
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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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