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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other interest expense $ (13,239) $ (13,990) $ (16,055) $ (25,844) $ (29,000) $ (30,440) $ (29,566) $ (28,010) $ (69,128) $ (117,016) $ (89,592)
Other operating expense                 (16,635) (14,937) (15,235)
Total before tax 3,878 18,820 24,080 (1,596) 16,888 13,260 13,828 9,355 45,182 53,331 65,485
Tax expense (benefit) (417) (4,489) (5,808) 206 (3,957) (2,536) (3,272) (2,287) (10,508) (12,052) (10,395)
Net income $ 3,461 $ 14,331 $ 18,272 $ (1,390) $ 12,931 $ 10,724 $ 10,556 $ 7,068 34,674 41,279 55,090
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
Net loss on sale of securities                 (701) (15) (1,920)
Tax expense (benefit)                 (216) (5) (595)
Net income                 (485) (10) (1,325)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Interest Rate Swap [Member]                      
Other operating expense                 (4,732) 1,392 (104)
Tax expense (benefit)                 (1,466) 431 (32)
Net income                 (3,266) 961 (72)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]                      
Other operating expense                 (390) (128) (530)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]                      
Other operating expense                 85 85 39
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Total before tax                 (305) (43) (491)
Tax expense (benefit)                 (94) (14) (155)
Net income                 $ (211) $ (29) $ (336)