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Investment Securities - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |  |
Gain on equity securities, net | $ 3,213,000 | $ 0 | $ 0
Pledged Financial Instruments, Not Separately Reported, Securities | 332,000,000 | 317,000,000 |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | 280,000,000 | 215,000,000 |
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank | $ 21,913,000 | $ 24,900,000 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% | 35.00%
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 | $ 0
Debt Securities, Available-for-sale, Amortized Cost | 1,028,883,000 | 1,097,645,000 |
Debt Securities, Available-for-sale, Realized Gain | 60,000 |  |
Amortized cost of securities available-for-sale | 1,028,883,000 | 1,097,645,000 |
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | 351,808,000 | 357,197,000 |
Federal home loan bank stock | 43,388,000 | 50,086,000 |
Federal reserve bank stock | 8,225,000 | 8,225,000 |
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block] | $ 0 |  |
Percentage of amount greater than shareholder's equity | 10.00% |  |
Debt Securities, Available-for-sale, Realized Loss | $ 2,600,000 |  |
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) | $ 291,000 |  |
percent of held to securities sold paid down | 96.30% |  |
Equity Securities, FV-NI | $ 1,649,000 | 1,935,000 |
Equity Securities without Readily Determinable Fair Value, Amount | 2,589,000 | 3,500,000 |
Other investment securities | 55,851,000 | 63,746,000 |
Debt Securities sold at a loss [Domain] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 245,000,000 |  |
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain | (3,500,000) |  |
Common Shares |  |  |
Schedule of Investments [Line Items] |  |  |
Gain on equity securities, net | (287,000) |  |
Securities sold at a gain [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,000,000 |  |
Amortized cost of securities available-for-sale |  |  | $ 0
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | 7,400,000 |  |
Available-for-sale Securities, Equity Securities | $ 444,000 |  |
Debt and Equity Securities, Realized Gain (Loss) |  | 1,821,000 |
U.S. Government sponsored entity asset-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Asset-backed securities mortgage portfolio, maturity term | 15 years |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,028,883,000 | 852,645,000 |
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | 46,530,000 | $ 56,785,000 |
Residential mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 705,300,000 |  |
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | 0 |  |
Collateralized mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 323,600,000 |  |
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | $ 46,500,000 |  |

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