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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
(Losses) gains on investment securities available-for-sale $ 0 $ (345)  
Income before income taxes 120,154 105,027 $ 101,360
Income tax expense (28,139) (22,613) (33,309)
Net income 92,015 82,414 $ 68,051
Unrealized gains and losses on available-for-sale securities | Amount reclassified from Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
(Losses) gains on investment securities available-for-sale 0 (345)  
Income before income taxes 0 (345)  
Income tax expense 0 83  
Net income $ 0 $ (262)