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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2021 | Mar. 18, 2020 | Oct. 18, 2019 | Sep. 23, 2019 | Jan. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Mar. 27, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock shares |  |  |  |  |  | 4,600,000 | 4,600,000 |  | 4,500,000 |
Treasury stock, Cost basis |  |  |  |  |  | $ 151,300 | $ 151,300 |  | $ 150,700 |
Shares repurchased |  |  |  |  |  | 56,349 | 56,349 | 315,851 |  |
Payments for repurchase of common stock |  |  |  |  |  |  | $ 2,509 | $ 12,716 |  |
Implementation CECL [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory capital modified transition amount percentage |  |  |  |  |  |  |  |  |  | 25.00%
Implementation CECL [Member] | Regulatory Capital Transition For First Two Years [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory capital transition percentage |  |  |  |  |  |  |  |  |  | 0.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2022 [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory capital transition percentage |  |  |  |  |  |  |  |  |  | 25.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2023 [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory capital transition percentage |  |  |  |  |  |  |  |  |  | 50.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2024 [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory capital transition percentage |  |  |  |  |  |  |  |  |  | 75.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2024 and Thereafter [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory capital transition percentage |  |  |  |  |  |  |  |  |  | 100.00%
Common Stock [Member] | Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized for repurchase |  |  |  |  |  | 5,500,000 | 5,500,000 |  |  |
Shares repurchased |  | 1,001,472 | 3,611,870 |  | 315,851 |  | 4,900,000 |  |  |
Shares purchased average cost per share |  |  |  |  | $ 40.26 |  | $ 37.65 |  |  |
Share repurchase, authorized amount |  |  | $ 185,000 |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  | $ 185,000 |  |  |  |  |  |  |
Percentage of shares repurchased among authorized |  |  | 75.00% |  |  |  |  |  |  |
Proceeds from repurchase of common stock |  | $ 12,100 |  |  |  |  |  |  |  |
2018 Stock Buyback Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized for repurchase | 4,300,000 |  |  | 5,500,000 |  |  |  |  |  |
Stock repurchase expiration date | Dec. 31, 2022 |  |  | Dec. 31, 2020 |  |  |  |  |  |
2018 Stock Buyback Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  | 56,349 |  |  |  |
Shares purchased average cost per share |  |  |  |  |  | $ 44.52 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares nonvested |  |  |  |  |  | 1,600,000 | 1,600,000 |  | 1,700,000 |

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