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Regulatory Capital and Dividends - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Feb. 09, 2016
Banking and Thrift [Abstract] |  |
Dividends available | $ 192,712,000 |
Dividend reinvestment and stock purchase plan, stockholder's maximum amount of cash payments per quarter in purchase of common stock | $ 2,500 |
Stock repurchase program |  | $ 15,000,000

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