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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 1,085,975  
Ending Balance 1,108,423 $ 1,022,594
Accumulated Other Comprehensive (Loss) Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 11,022 (1,008)
Other comprehensive income (loss) before reclassifications (5,252) 2,460
Amounts reclassified out of accumulated other comprehensive (loss) income 460 4,838
Other comprehensive income (loss) (4,792) 7,298
Ending Balance 6,230 6,290
Net Unrealized Gains On Securities Available-For-Sale [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 12,092 (441)
Other comprehensive income (loss) before reclassifications (4,948) 3,288
Amounts reclassified out of accumulated other comprehensive (loss) income 1 4,728
Other comprehensive income (loss) (4,947) 8,016
Ending Balance 7,145 7,575
Net Unrealized Loss On Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,070) (567)
Other comprehensive income (loss) before reclassifications (304) (828)
Amounts reclassified out of accumulated other comprehensive (loss) income 459 110
Other comprehensive income (loss) 155 (718)
Ending Balance $ (915) $ (1,285)