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Other Comprehensive Income (Loss), Summary of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance $ 208,489 $ 204,593 $ 197,787 $ 191,542 $ 184,661 $ 183,304 $ 181,372 $ 181,321 $ 191,542 $ 181,321 $ 172,521
Reclassification adjustment for effect of enacted tax law changes                     0
Other comprehensive gain (loss) 327 597 3,395 3,050 3,419 (1,677) (904) (2,933) 7,369 (2,095) (1,378)
Balance 212,508 $ 208,489 $ 204,593 197,787 191,542 $ 184,661 $ 183,304 181,372 212,508 191,542 181,321
Accumulated Net Gain (Loss) from Cash Flow Hedges                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       $ 1,438       $ 1,544 1,438 1,544 1,163
Unrealized gains (losses) during the period                 (1,697) (134) 165
Related deferred taxes                 356 28 (58)
Reclassification adjustment for effect of enacted tax law changes                 0 0 274
Other comprehensive gain (loss)                 (1,341) (106) 381
Balance $ 97       $ 1,438       $ 97 $ 1,438 $ 1,544