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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance $ 549,464 $ 532,608 $ 513,853
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings   2,073  
Impact of adoption of Accounting Standard Update 2016-01 2,716 0  
Total other comprehensive income (loss), net of tax 2,945 (2,472) (624)
Balance 579,672 549,464 532,608
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Balance (15,649) (5,522) (3,859)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings   (1,325)  
Other comprehensive income before reclassifications, net of tax 11,657 (10,127) (1,771)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 10 1,325 108
Total other comprehensive income (loss), net of tax 11,667 (8,802) (1,663)
Balance (3,982) (15,649) (5,522)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Balance 3,704 231  
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings   50  
Other comprehensive income before reclassifications, net of tax (8,606) 3,351 105
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (961) 72 126
Total other comprehensive income (loss), net of tax (9,567) 3,423 231
Balance (5,863) 3,704 231
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Balance (1,673) (3,695) (4,503)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings   (798)  
Other comprehensive income before reclassifications, net of tax 661 2,484 485
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 29 336 323
Total other comprehensive income (loss), net of tax 690 2,820 808
Balance (983) (1,673) (3,695)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]      
Balance 866    
Impact of adoption of Accounting Standard Update 2016-01   779  
Other comprehensive income before reclassifications, net of tax 155 87  
Total other comprehensive income (loss), net of tax 155 87  
Balance 1,021 866  
AOCI Attributable to Parent [Member]      
Balance (12,752) (8,986) (8,362)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings   (2,073)  
Impact of adoption of Accounting Standard Update 2016-01 0 779  
Other comprehensive income before reclassifications, net of tax 3,867 (4,205) (1,181)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (922) 1,733 557
Total other comprehensive income (loss), net of tax 2,945 (2,472) (624)
Balance $ (9,807) $ (12,752) $ (8,986)