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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Changes in accumulated other comprehensive income (loss) by component, net of tax      
Beginning balance $ 1,220,434 $ 994,964 $ 994,964
Unrealized gains (losses) on debt securities available for sale:      
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect (8,589) (1,940)  
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax 21,497 4,859  
Unrealized gains on debt securities transferred from held to maturity to available for sale, Tax Effect 1,364  
Unrealized gains on debt securities transferred from held to maturity to available for sale, Net of Tax   3,416  
Amounts reclassified from accumulated other comprehensive income, Tax Effect 448 (52)  
Amounts reclassified from accumulated other comprehensive income, Net of Tax 1,108 (132)  
Unrealized gains (losses) on cash flow hedges:      
Unrealized holding gains (losses) on cash flow hedges, Tax Effect (892)  
Unrealized holding gains (losses) on cash flow hedges, Net of Tax (2,237)    
Amounts reclassified from accumulated other comprehensive income, Tax Effect (4)    
Reclassification adjustment for realized losses (gains) on cash flow hedges (11)    
Ending balance 1,217,585 1,186,141 1,220,434
Accumulated Other Comprehensive Income (Loss)      
Changes in accumulated other comprehensive income (loss) by component, net of tax      
Beginning balance 14,960 (6,812) (6,812)
Unrealized gains (losses) on cash flow hedges:      
Accumulated other comprehensive income (loss) ending balance period, Before Tax 46,298 2,235  
Accumulated other comprehensive income (loss) ending balance period, Tax Effect (13,197) (640)  
Ending balance 33,101 1,595 14,960
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 21,192 (9,528) (9,528)
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect (6,032) 2,716 2,716
Beginning balance 15,160 (6,812) (6,812)
Unrealized gains (losses) on debt securities available for sale:      
Unrealized holding gains (losses) on debt securities available for sale, Before Tax 30,086 6,799  
Unrealized holding gains (losses) on debt securities available for sale, Tax Effect (8,589) (1,940)  
Unrealized holding gains (losses) on debt securities available for sale, Net of Tax 21,497 4,859  
Unrealized gains on debt securities transferred from held to maturity to available for sale, Before Tax   4,780  
Unrealized gains on debt securities transferred from held to maturity to available for sale, Tax Effect 1,364  
Unrealized gains on debt securities transferred from held to maturity to available for sale, Net of Tax   3,416  
Amounts reclassified from accumulated other comprehensive income, Before Tax 1,556 (184)  
Amounts reclassified from accumulated other comprehensive income, Tax Effect 448 (52)  
Amounts reclassified from accumulated other comprehensive income, Net of Tax 1,108 (132)  
Unrealized gains (losses) on cash flow hedges:      
Accumulated other comprehensive income (loss) ending balance period, Before Tax 49,722 2,235 21,192
Accumulated other comprehensive income (loss) ending balance period, Tax Effect (14,173) (640) (6,032)
Ending balance 35,549 1,595 15,160
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 (280)    
Accumulated other comprehensive income (loss) beginning balance period, Tax Effect 80    
Beginning balance (200)    
Unrealized gains (losses) on cash flow hedges:      
Unrealized holding gains (losses) on cash flow hedges, Before Tax (3,129)    
Unrealized holding gains (losses) on cash flow hedges, Tax Effect 892  
Unrealized holding gains (losses) on cash flow hedges, Net of Tax (2,237)    
Amounts reclassified from accumulated other comprehensive income, Before Tax (15)    
Amounts reclassified from accumulated other comprehensive income, Tax Effect 4  
Reclassification adjustment for realized losses (gains) on cash flow hedges (11)    
Accumulated other comprehensive income (loss) ending balance period, Before Tax (3,424)   (280)
Accumulated other comprehensive income (loss) ending balance period, Tax Effect 976   80
Ending balance $ (2,448)   $ (200)