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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 1,085,975  
Ending Balance $ 1,053,665 $ 1,064,322 1,053,665 $ 1,064,322
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 7,600 7,588 11,022 (1,008)
Other comprehensive income (loss) before reclassifications 568 203 (3,768) 3,023
Amounts reclassified out of accumulated other comprehensive (loss) income 452 477 1,366 6,253
Other comprehensive income (loss) 1,020 680 (2,402) 9,276
Ending Balance 8,620 8,268 8,620 8,268
Net Unrealized Gains On Securities Available-For-Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 8,408 8,885 12,092 (441)
Other comprehensive income (loss) before reclassifications 920 566 (2,767) 5,165
Amounts reclassified out of accumulated other comprehensive (loss) income 2 1 5 4,728
Other comprehensive income (loss) 922 567 (2,762) 9,893
Ending Balance 9,330 9,452 9,330 9,452
Net Unrealized Loss On Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (808) (1,297) (1,070) (567)
Other comprehensive income (loss) before reclassifications (352) (363) (1,001) (2,142)
Amounts reclassified out of accumulated other comprehensive (loss) income 450 476 1,361 1,525
Other comprehensive income (loss) 98 113 360 (617)
Ending Balance $ (710) $ (1,184) $ (710) $ (1,184)