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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 1,045,478 $ 999,877  
Ending Balance 1,085,975 1,045,478 $ 999,877
Accumulated Other Comprehensive (Loss) Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1,008) (10,963) (2,949)
Transfer of securities held-to-maturity to available-for-sale   (12,041)  
Other comprehensive income (loss) before reclassifications 5,312 11,893 (9,659)
Amounts reclassified out of accumulated other comprehensive (loss) income 6,718 10,103 1,645
Other comprehensive income (loss) 12,030 9,955 (8,014)
Ending Balance 11,022 (1,008) (10,963)
Net Unrealized Gains On Securities Available-For-Sale [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (441) (10,972) (2,638)
Transfer of securities held-to-maturity to available-for-sale   (12,041)  
Other comprehensive income (loss) before reclassifications 7,803 14,335 (8,104)
Amounts reclassified out of accumulated other comprehensive (loss) income 4,730 8,237 (230)
Other comprehensive income (loss) 12,533 10,531 (8,334)
Ending Balance 12,092 (441) (10,972)
Net Unrealized Loss On Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (567) 9 (311)
Transfer of securities held-to-maturity to available-for-sale   0  
Other comprehensive income (loss) before reclassifications (2,491) (2,442) (1,555)
Amounts reclassified out of accumulated other comprehensive (loss) income 1,988 1,866 1,875
Other comprehensive income (loss) (503) (576) 320
Ending Balance $ (1,070) $ (567) $ 9