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Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 323,809 |
Unrealized Gains | 578 |
Unrealized Losses | (6,971) |
Fair Value (Estimated) | 317,416 |
Securities available-for-sale, Amortized Cost |  | $ 300,872
Securities available-for-sale, Unrealized Gains |  | 859
Securities available-for-sale, Unrealized Losses |  | (4,532)
Securities available-for-sale, Fair Value (Estimated) |  | 297,199
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 255,663 | 256,567
Unrealized Gains | 1,382 | 4,499
Unrealized Losses | (6,145) | (1,411)
Fair Value (Estimated) | 250,900 | 259,655
Restricted equity securities |  |
Federal Home Loan Bank Stock | 10,549 | 9,321
Federal Reserve Bank Stock | 1,037 | 1,037
Restricted equity securities | 11,586 | 10,358
State and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,955 |
Unrealized Gains | 0 |
Unrealized Losses | (239) |
Fair Value (Estimated) | 4,716 |
Securities available-for-sale, Amortized Cost |  | 6,860
Securities available-for-sale, Unrealized Gains |  | 16
Securities available-for-sale, Unrealized Losses |  | (107)
Securities available-for-sale, Fair Value (Estimated) |  | 6,769
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 221,958 | 217,828
Unrealized Gains | 1,046 | 3,931
Unrealized Losses | (5,418) | (1,103)
Fair Value (Estimated) | 217,586 | 220,656
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 313,854 |
Unrealized Gains | 571 |
Unrealized Losses | (6,732) |
Fair Value (Estimated) | 307,693 |
Securities available-for-sale, Amortized Cost |  | 293,689
Securities available-for-sale, Unrealized Gains |  | 722
Securities available-for-sale, Unrealized Losses |  | (4,422)
Securities available-for-sale, Fair Value (Estimated) |  | 289,989
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 18,250 | 23,284
Unrealized Gains | 336 | 568
Unrealized Losses | (255) | (128)
Fair Value (Estimated) | 18,331 | 23,724
U.S. Government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,000 |
Unrealized Gains | 7 |
Unrealized Losses | 0 |
Fair Value (Estimated) | 5,007 |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 11,155 | 11,155
Unrealized Gains | 0 | 0
Unrealized Losses | (472) | (180)
Fair Value (Estimated) | 10,683 | 10,975
Corporate securities |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 4,300 | 4,300
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value (Estimated) | $ 4,300 | 4,300
Other equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, Amortized Cost |  | 323
Securities available-for-sale, Unrealized Gains |  | 121
Securities available-for-sale, Unrealized Losses |  | (3)
Securities available-for-sale, Fair Value (Estimated) |  | $ 441

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