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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 663,268 | $ 608,909
Gross Unrealized Gains | 12,488 | 2,308
Gross Unrealized Losses | (2,337) | (10,869)
Available-for-sale Securities, Fair Value | 673,419 | 600,348
Held-to-maturity, Amortized Cost | 213,768 | 210,112
Held-to-maturity, Gross Unrealized Gains | 6,375 | 1,853
Held-to-maturity, Gross Unrealized Losses | (252) | (3,692)
Held-to-maturity, Fair Value | 219,891 | 208,273
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 253,201 | 210,386
Gross Unrealized Gains | 8,090 | 1,495
Gross Unrealized Losses | (1,126) | (2,578)
Available-for-sale Securities, Fair Value | 260,165 | 209,303
Held-to-maturity, Amortized Cost | 195,719 | 191,269
Held-to-maturity, Gross Unrealized Gains | 6,196 | 1,773
Held-to-maturity, Gross Unrealized Losses | (220) | (3,366)
Held-to-maturity, Fair Value | 201,695 | 189,676
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
Gross Unrealized Gains | 2,878 | 625
Gross Unrealized Losses | (522) | (3,185)
Available-for-sale Securities, Fair Value | 231,522 | 185,003
Held-to-maturity, Amortized Cost | 4,884 | 5,144
Held-to-maturity, Gross Unrealized Gains | 12 | 6
Held-to-maturity, Gross Unrealized Losses | (19) | (120)
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
Gross Unrealized Gains | 818 | 80
Gross Unrealized Losses | (673) | (4,823)
Available-for-sale Securities, Fair Value | 153,523 | 178,736
Held-to-maturity, Amortized Cost | 13,165 | 13,699
Held-to-maturity, Gross Unrealized Gains | 167 | 74
Held-to-maturity, Gross Unrealized Losses | (13) | (206)
Held-to-maturity, Fair Value | 13,319 | 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 | 9,915 | 16,815
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (16) | (208)
Available-for-sale Securities, Fair Value | 9,901 | 16,608
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 17,608 | 10,666
Gross Unrealized Gains | 700 | 107
Gross Unrealized Losses |  | (75)
Available-for-sale Securities, Fair Value | $ 18,308 | $ 10,698

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