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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 1,085,975  
Ending Balance $ 1,079,997 $ 1,041,284 1,079,997 $ 1,041,284
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 6,230 6,290 11,022 (1,008)
Other comprehensive income (loss) before reclassifications 917 793 (4,336) 2,823
Amounts reclassified out of accumulated other comprehensive (loss) income 453 505 914 5,773
Other comprehensive income (loss) 1,370 1,298 (3,422) 8,596
Ending Balance 7,600 7,588 7,600 7,588
Net Unrealized Gains On Securities Available-For-Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 7,145 7,575 12,092 (441)
Other comprehensive income (loss) before reclassifications 1,262 1,310 (3,687) 4,598
Amounts reclassified out of accumulated other comprehensive (loss) income 1 0 3 4,728
Other comprehensive income (loss) 1,263 1,310 (3,684) 9,326
Ending Balance 8,408 8,885 8,408 8,885
Net Unrealized Loss On Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (915) (1,285) (1,070) (567)
Other comprehensive income (loss) before reclassifications (345) (517) (649) (1,775)
Amounts reclassified out of accumulated other comprehensive (loss) income 452 505 911 1,045
Other comprehensive income (loss) 107 (12) 262 (730)
Ending Balance $ (808) $ (1,297) $ (808) $ (1,297)