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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 822,089 | $ 608,909
Gross Unrealized Gains | 15,961 | 2,308
Gross Unrealized Losses | (3,274) | (10,869)
Available-for-sale Securities, Fair Value | 834,776 | 600,348
Held-to-maturity, Amortized Cost | 207,899 | 210,112
Held-to-maturity, Gross Unrealized Gains | 7,336 | 1,853
Held-to-maturity, Gross Unrealized Losses | (88) | (3,692)
Held-to-maturity, Fair Value | 215,147 | 208,273
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 396,931 | 210,386
Gross Unrealized Gains | 11,288 | 1,495
Gross Unrealized Losses | (2,451) | (2,578)
Available-for-sale Securities, Fair Value | 405,768 | 209,303
Held-to-maturity, Amortized Cost | 190,767 | 191,269
Held-to-maturity, Gross Unrealized Gains | 7,129 | 1,773
Held-to-maturity, Gross Unrealized Losses | (54) | (3,366)
Held-to-maturity, Fair Value | 197,842 | 189,676
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
Gross Unrealized Gains | 2,543 | 625
Gross Unrealized Losses | (563) | (3,185)
Available-for-sale Securities, Fair Value | 269,252 | 185,003
Held-to-maturity, Amortized Cost | 4,560 | 5,144
Held-to-maturity, Gross Unrealized Gains | 13 | 6
Held-to-maturity, Gross Unrealized Losses | (5) | (120)
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
Gross Unrealized Gains | 1,207 | 80
Gross Unrealized Losses | (258) | (4,823)
Available-for-sale Securities, Fair Value | 146,572 | 178,736
Held-to-maturity, Amortized Cost | 12,572 | 13,699
Held-to-maturity, Gross Unrealized Gains | 194 | 74
Held-to-maturity, Gross Unrealized Losses | (29) | (206)
Held-to-maturity, Fair Value | 12,737 | 13,567
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,415 | 16,815
Gross Unrealized Gains |  | 1
Gross Unrealized Losses | (2) | (208)
Available-for-sale Securities, Fair Value | 1,413 | 16,608
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 10,848 | 10,666
Gross Unrealized Gains | 923 | 107
Gross Unrealized Losses |  | (75)
Available-for-sale Securities, Fair Value | $ 11,771 | $ 10,698

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