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Summary of Significant Accounting Policies - Additional information (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($) lease | Jan. 01, 2018 USD ($)
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Reserve and clearing requirement balance | $ 0 | $ 0 |  |  |
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 |  |  |  |  | $ (188)
Aggregate carrying value of properties foreclosed on | 3,300 |  |  |  |
Net valuation adjustments subsequent to foreclosures | 115 |  |  |  |
Proceeds from sales of OREO | 6,667 | 14,802 | $ 17,390 |  |
Impairment of investments in affordable housing partnership | 0 | 4,846 | $ 0 |  |
Impairment of investments in affordable housing partnership, noninterest expense |  | 3,300 |  |  |
Impairment of investments in affordable housing partnership, Tax Act result |  | 1,600 |  |  |
Payments of cash dividends on Common Stock | 71,600 | 67,700 |  |  |
Loss Contingency Accrual | 755 | 414 |  |  |
Reclassification of stranded tax effects to retained earnings - ASU 2018-02 |  | 0 |  |  |
Accounting Standards Update 2016-02 | Subsequent Event |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating leases | lease |  |  |  | 96 |
Right-of-use asset |  |  |  | $ 64,300 |
Right-of-use liability |  |  |  | $ 64,300 |
Retained Earnings |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 | $ (469) |  |  |  | $ (469)
Reclassification of stranded tax effects to retained earnings - ASU 2018-02 |  | $ 3,597 |  |  |
Minimum | Buildings |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 15 years |  |  |  |
Minimum | Furniture , fixture and equipment |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 3 years |  |  |  |
Minimum | Computer equipment |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 1 year |  |  |  |
Minimum | Computer Software |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 1 year |  |  |  |
Maximum | Buildings |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 39 years |  |  |  |
Maximum | Furniture , fixture and equipment |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 10 years |  |  |  |
Maximum | Computer equipment |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 5 years |  |  |  |
Maximum | Computer Software |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives | 5 years |  |  |  |
Core deposits | Minimum |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Amortization period | 7 years |  |  |  |
Core deposits | Maximum |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |
Amortization period | 10 years |  |  |  |

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