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Selected Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 75,548 | $ 76,848 | $ 80,479 | $ 87,589 | $ 82,457 | $ 79,813 | $ 79,624 | $ 78,590 | $ 320,464 | $ 320,484 | $ 289,826
Interest expense | 5,620 | 7,572 | 10,331 | 17,553 | 18,045 | 18,617 | 18,797 | 18,234 | 41,076 | 73,693 | 55,388
Provision for credit losses | 7,130 | 17,485 | 86,759 | 20,050 | 2,105 | 4,913 | 2,205 | 5,649 | 131,424 | 14,873 | 14,995
Net Interest Income After Provision for Credit Losses | 62,798 | 51,791 | (16,611) | 49,986 | 62,307 | 56,283 | 58,622 | 54,707 | 147,964 | 231,918 | 219,443
Security gains (losses), net | 0 | 0 | 142 | 0 | (26) | 0 | 0 | 0 | 142 | (26) | 0
Noninterest income | 15,609 | 16,483 | 15,082 | 12,403 | 15,257 | 13,063 | 12,901 | 11,363 |  |  |
Noninterest expense | 48,529 | 48,246 | 43,478 | 46,391 | 50,178 | 37,667 | 40,352 | 38,919 | 186,644 | 167,116 | 145,445
Income Before Taxes | 29,878 | 20,028 | (44,865) | 15,998 | 27,360 | 31,679 | 31,171 | 27,151 |  |  |
Income taxes (benefit) expense | 5,702 | 3,323 | (11,793) | 2,767 | 5,091 | 4,743 | 5,070 | 4,222 | (1) | 19,126 | 17,845
Net Income | $ 24,176 | $ 16,705 | $ (33,072) | $ 13,231 | $ 22,269 | $ 26,936 | $ 26,101 | $ 22,929 | $ 21,040 | $ 98,234 | $ 105,334
Per Share Data |  |  |  |  |  |  |  |  |  |  |
Common earnings per share-diluted (in USD per share) | $ 0.62 | $ 0.43 | $ (0.85) | $ 0.34 | $ 0.62 | $ 0.79 | $ 0.76 | $ 0.66 | $ 0.53 | $ 2.82 | $ 3.01
Dividends declared per common share (in USD per share) | 0.28 | 0.28 | 0.28 | 0.28 | 0.28 | 0.27 | 0.27 | 0.27 | $ 1.12 | $ 1.09 | $ 0.99
Common book value (in USD per share) | $ 29.38 | $ 29.10 | $ 28.93 | $ 30.06 | $ 30.13 | $ 28.69 | $ 28.11 | $ 27.47 |  |  |

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