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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 608,909 | $ 513,602
Gross Unrealized Gains | 2,308 | 2,502
Gross Unrealized Losses | (10,869) | (6,439)
Available-for-sale Securities, Fair Value | 600,348 | 509,665
Held-to-maturity, Amortized Cost | 210,112 | 200,448
Held-to-maturity, Gross Unrealized Gains | 1,853 | 3,726
Held-to-maturity, Gross Unrealized Losses | (3,692) | (3,089)
Held-to-maturity, Fair Value | 208,273 | 201,085
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 210,386 | 148,045
Gross Unrealized Gains | 1,495 | 2,189
Gross Unrealized Losses | (2,578) | (670)
Available-for-sale Securities, Fair Value | 209,303 | 149,564
Held-to-maturity, Amortized Cost | 191,269 | 179,836
Held-to-maturity, Gross Unrealized Gains | 1,773 | 3,493
Held-to-maturity, Gross Unrealized Losses | (3,366) | (2,932)
Held-to-maturity, Fair Value | 189,676 | 180,397
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
Gross Unrealized Gains | 625 | 45
Gross Unrealized Losses | (3,185) | (2,551)
Available-for-sale Securities, Fair Value | 185,003 | 130,365
Held-to-maturity, Amortized Cost | 5,144 | 5,734
Held-to-maturity, Gross Unrealized Gains | 6 | 17
Held-to-maturity, Gross Unrealized Losses | (120) | (69)
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
Gross Unrealized Gains | 80 | 155
Gross Unrealized Losses | (4,823) | (2,985)
Available-for-sale Securities, Fair Value | 178,736 | 208,657
Held-to-maturity, Amortized Cost | 13,699 | 14,878
Held-to-maturity, Gross Unrealized Gains | 74 | 216
Held-to-maturity, Gross Unrealized Losses | (206) | (88)
Held-to-maturity, Fair Value | 13,567 | 15,006
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 16,815 | 19,277
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (208) | (225)
Available-for-sale Securities, Fair Value | 16,608 | 19,052
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost |  | 1,650
Gross Unrealized Losses |  | (8)
Available-for-sale Securities, Fair Value |  | 1,642
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 10,666 | 272
Gross Unrealized Gains | 107 | 113
Gross Unrealized Losses | (75) |
Available-for-sale Securities, Fair Value | $ 10,698 | $ 385

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