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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in accumulated other comprehensive income (loss) by component, net of tax      
Accumulated other comprehensive income (loss) beginning balance period, Net of Tax $ 994,964 $ 935,003 $ 594,314
Unrealized gains (losses) on debt securities available for sale:      
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect (10,251) 1,861 1,520
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax 25,739 (4,670) (2,174)
Unrealized losses on debt securities transferred from held to maturity to available for sale, Tax Effect 1,293
Unrealized losses on debt securities transferred from held to maturity to available for sale, Net of Tax (3,244)    
Amounts reclassified from accumulated other comprehensive income, Tax Effect (210) 507 (471)
Amounts reclassified from accumulated other comprehensive income, Net of Tax 523 (1,273) 672
Unrealized gains (losses) on cash flow hedges:      
Unrealized holding gains (losses) on cash flow hedges, Tax Effect (81)
Unrealized holding gains (losses) on cash flow hedges, Net of Tax (202)    
Amounts reclassified from accumulated other comprehensive income, Tax Effect 1
Reclassification adjustment for realized losses (gains) on cash flow hedges 2    
Accumulated other comprehensive income (loss) ending balance period, Net of Tax 1,220,434 994,964 935,003
Accumulated Other Comprehensive Income (Loss)      
Changes in accumulated other comprehensive income (loss) by component, net of tax      
Accumulated other comprehensive income (loss) beginning balance period, Before Tax (9,528) (4,777)  
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect 2,716 1,967  
Accumulated other comprehensive income (loss) beginning balance period, Net of Tax (6,812) (2,810) 36
Unrealized gains (losses) on debt securities available for sale:      
Tax Cuts and Jobs Act of 2017 reclassification   (605)  
Unrealized gains (losses) on cash flow hedges:      
Accumulated other comprehensive income (loss) ending balance period, Before Tax 20,912 (9,528) (4,777)
Accumulated other comprehensive income (loss) ending balance period, Tax Effect (5,952) 2,716 1,967
Accumulated other comprehensive income (loss) ending balance period, Net of Tax 14,960 (6,812) (2,810)
Unrealized gains (losses) on debt securities available for sale      
Changes in accumulated other comprehensive income (loss) by component, net of tax      
Accumulated other comprehensive income (loss) beginning balance period, Before Tax (9,528) (4,777) 60
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect 2,716 1,967 (24)
Accumulated other comprehensive income (loss) beginning balance period, Net of Tax (6,812) (2,810) 36
Unrealized gains (losses) on debt securities available for sale:      
Unrealized holding gains (losses) on debt securities available for sale, Before Tax 35,990 (6,531) (3,694)
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect (10,251) 1,861 1,520
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax 25,739 (4,670) (2,174)
Unrealized losses on debt securities transferred from held to maturity to available for sale, Before Tax (4,537)    
Unrealized losses on debt securities transferred from held to maturity to available for sale, Tax Effect 1,293    
Unrealized losses on debt securities transferred from held to maturity to available for sale, Net of Tax (3,244)    
Amounts reclassified from accumulated other comprehensive income, Before Tax (733) 1,780 (1,143)
Amounts reclassified from accumulated other comprehensive income, Tax Effect 210 (507) 471
Amounts reclassified from accumulated other comprehensive income, Net of Tax (523) 1,273 (672)
Tax Cuts and Jobs Act of 2017 reclassification   (605)  
Unrealized gains (losses) on cash flow hedges:      
Accumulated other comprehensive income (loss) ending balance period, Before Tax 21,192 (9,528) (4,777)
Accumulated other comprehensive income (loss) ending balance period, Tax Effect (6,032) 2,716 1,967
Accumulated other comprehensive income (loss) ending balance period, Net of Tax 15,160 $ (6,812) $ (2,810)
Unrealized gains (losses) on cash flow hedges      
Unrealized gains (losses) on debt securities available for sale:      
Amounts reclassified from accumulated other comprehensive income, Before Tax 3    
Unrealized gains (losses) on cash flow hedges:      
Unrealized holding gains (losses) on cash flow hedges, Before Tax (283)    
Unrealized holding gains (losses) on cash flow hedges, Tax Effect 81    
Unrealized holding gains (losses) on cash flow hedges, Net of Tax (202)    
Amounts reclassified from accumulated other comprehensive income, Tax Effect (1)    
Reclassification adjustment for realized losses (gains) on cash flow hedges (2)    
Accumulated other comprehensive income (loss) ending balance period, Before Tax (280)    
Accumulated other comprehensive income (loss) ending balance period, Tax Effect 80    
Accumulated other comprehensive income (loss) ending balance period, Net of Tax $ (200)