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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Changes in accumulated other comprehensive income (loss) by component, net of tax    
Beginning balance $ 1,270,069 $ 1,220,434
Unrealized gains (losses) on debt securities available for sale:    
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect (11,993) 8,589
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax (30,079) 21,497
Amounts reclassified from accumulated other comprehensive income, Tax Effect 7 448
Amounts reclassified from accumulated other comprehensive income, Net of Tax (18) (1,108)
Unrealized gains (losses) on cash flow hedges:    
Unrealized holding gains (losses) on cash flow hedges, Tax Effect 164 (892)
Unrealized holding gains (losses) on cash flow hedges, Net of Tax 410 (2,237)
Amounts reclassified from accumulated other comprehensive income, Tax Effect 79 (4)
Amounts reclassified from accumulated other comprehensive income, Net of Tax 199 (11)
Ending balance 1,265,822 1,217,585
Accumulated Other Comprehensive Income (Loss)    
Changes in accumulated other comprehensive income (loss) by component, net of tax    
Beginning balance 33,309 14,960
Unrealized gains (losses) on cash flow hedges:    
Accumulated other comprehensive income (loss) ending balance period, Before Tax 5,344 46,298
Accumulated other comprehensive income (loss) ending balance period, Tax Effect (1,523) (13,197)
Ending balance 3,821 33,101
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 49,644 21,192
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect (14,151) (6,032)
Beginning balance 35,493 15,160
Unrealized gains (losses) on debt securities available for sale:    
Unrealized holding gains (losses) on debt securities available for sale, Before Tax (42,072) 30,086
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect 11,993 (8,589)
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax (30,079) 21,497
Amounts reclassified from accumulated other comprehensive income, Before Tax (25) (1,556)
Amounts reclassified from accumulated other comprehensive income, Tax Effect 7 448
Amounts reclassified from accumulated other comprehensive income, Net of Tax (18) (1,108)
Unrealized gains (losses) on cash flow hedges:    
Accumulated other comprehensive income (loss) ending balance period, Before Tax 7,547 49,722
Accumulated other comprehensive income (loss) ending balance period, Tax Effect (2,151) (14,173)
Ending balance 5,396 35,549
Unrealized gains (losses) on cash flow hedges    
Changes in accumulated other comprehensive income (loss) by component, net of tax    
Accumulated other comprehensive income (loss) beginning balance period, Before Tax (3,055) (280)
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect 871 80
Beginning balance (2,184) (200)
Unrealized gains (losses) on cash flow hedges:    
Unrealized holding gains (losses) on cash flow hedges, Before Tax 574 (3,129)
Unrealized holding gains (losses) on cash flow hedges, Tax Effect (164) 892
Unrealized holding gains (losses) on cash flow hedges, Net of Tax 410 (2,237)
Amounts reclassified from accumulated other comprehensive income, Before Tax 278 (15)
Amounts reclassified from accumulated other comprehensive income, Tax Effect (79) 4
Amounts reclassified from accumulated other comprehensive income, Net of Tax 199 (11)
Accumulated other comprehensive income (loss) ending balance period, Before Tax (2,203) (3,424)
Accumulated other comprehensive income (loss) ending balance period, Tax Effect 628 976
Ending balance $ (1,575) $ (2,448)