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Condensed Financial Information (parent company only) - Statements of Cash Flows (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
Cash Flow From Operating Activities:                      
Net income $ 45,135 $ 36,210 $ 32,992 $ 34,263 $ 47,830 $ 36,757 $ 41,056 $ 38,817 $ 148,600 $ 164,460 $ 159,139
Adjustments to Reconcile Net Income to Net Cash:                      
Share-based compensation                 4,600 4,115 3,592
Net Change in:                      
Net cash provided by operating activities                 204,811 178,407 180,235
Cash Flow From Investing Activities:                      
Net cash received in acquisition                 0 10,207 0
Other                 (9,278) (8,564) 804
Net cash used in investing activities                 (1,552,025) (1,006,399) (575,576)
Cash Flows from Financing Activities:                      
Repayment of borrowings                 (621,548) (643,169) (1,677,860)
Stock issued under employee benefit plans                 639 702 707
Stock issued under dividend reinvestment and stock purchase plan                 1,726 1,531 1,211
Stock options exercised                 115 144 1,598
Restricted shares withheld for taxes                 (980) (1,680) (1,902)
Repurchase of common stock                 (55,912) (19,041) 0
Net cash provided by financing activities                 1,362,909 865,946 379,683
Net Change in Cash and Cash Equivalents                 15,695 37,954 (15,658)
Cash and Cash Equivalents, January 1       177,201       139,247 177,201 139,247 154,905
Cash and Cash Equivalents, December 31 192,896       177,201       192,896 177,201 139,247
Parent                      
Cash Flow From Operating Activities:                      
Net income                 148,600 164,460 159,139
Adjustments to Reconcile Net Income to Net Cash:                      
Share-based compensation                 1,502 1,339 1,256
Distributions in excess of (equity in undistributed) income of subsidiaries                 (89,465) (51,368) (68,329)
Net Change in:                      
Other assets                 4,038 (8,944) 584
Other liabilities                 (1,521) 4,611 274
Investment in subsidiaries - operating activities                 235 (268) 841
Net cash provided by operating activities                 63,389 109,830 93,765
Cash Flow From Investing Activities:                      
Net cash received in acquisition                 0 78 0
Other                 0 0 2,189
Net cash used in investing activities                 0 78 2,189
Cash Flows from Financing Activities:                      
Cash dividends                 (56,542) (51,276) (41,660)
Repayment of borrowings                 (20,310) 0 0
Stock issued under employee benefit plans                 639 702 707
Stock issued under dividend reinvestment and stock purchase plan                 1,726 1,531 1,211
Stock options exercised                 115 144 1,598
Restricted shares withheld for taxes                 (980) (1,680) (1,902)
Repurchase of common stock                 (55,912) (19,041) 0
Net cash provided by financing activities                 (131,264) (69,620) (40,046)
Net Change in Cash and Cash Equivalents                 (67,875) 40,288 55,908
Cash and Cash Equivalents, January 1       $ 127,723       $ 87,435 127,723 87,435 31,527
Cash and Cash Equivalents, December 31 $ 59,848       $ 127,723       $ 59,848 $ 127,723 $ 87,435