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Stockholders' Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (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
Tax expense (benefit) $ 3,957 $ 2,536 $ 3,272 $ 2,287 $ 1,046 $ 1,910 $ 4,489 $ 2,950 $ 12,052 $ 10,395 $ 25,013
Net income, as reported 12,931 10,724 10,556 7,068 12,422 17,333 13,923 11,412 41,279 55,090 41,121
Other expense                 (14,937) (15,235) (15,239)
Total before tax 16,888 13,260 13,828 9,355 13,468 19,243 18,412 14,362 53,331 65,485 66,134
Tax expense (benefit) $ (3,957) $ (2,536) $ (3,272) $ (2,287) $ (1,046) $ (1,910) $ (4,489) $ (2,950) (12,052) (10,395) (25,013)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
Net loss on sale of securities                 (15) (1,920) (186)
Tax expense (benefit)                 5 595 78
Net income, as reported                 (10) (1,325) (108)
Tax expense (benefit)                 (5) (595) (78)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Interest Rate Swap [Member]                      
Tax expense (benefit)                 (431) 32 58
Net income, as reported                 961 (72) (126)
Other expense                 1,392 (104) (184)
Tax expense (benefit)                 431 (32) (58)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]                      
Other expense                 (128) (530) (605)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]                      
Other expense                 85 39 45
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Tax expense (benefit)                 14 155 237
Net income, as reported                 (29) (336) (323)
Total before tax                 (43) (491) (560)
Tax expense (benefit)                 $ (14) $ (155) $ (237)