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Parent Company Financial Information (Condensed 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
Operating Activities                      
Net income $ 58,300 $ 44,734 $ 36,582 $ 14,628 $ 46,129 $ 50,727 $ 51,724 $ 45,871 $ 154,244 $ 194,451 $ 172,882
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock-based compensation expense                 10,737 9,271 8,354
Net cash provided by operating activities                 192,292 204,747 237,201
Financing Activities                      
Cash dividends paid                 (95,509) (101,911) (83,440)
Repayments of Junior Subordinated Debt                 0 0 8,248
Purchase and retirement of common stock                 2,522 2,792 2,677
Purchase of treasury stock                 (20,000) (50,834) 0
Proceeds from exercise of stock options and employee stock purchase plan                 2,028 2,025 1,857
Net cash provided by financing activities                 2,132,586 630,789 203,936
Cash and cash equivalents at beginning of period       247,673       277,587 247,673 277,587 342,533
Cash and cash equivalents at end of period 653,766       247,673       653,766 247,673 277,587
Parent Company                      
Operating Activities                      
Net income                 154,244 194,451 172,882
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed earnings of subsidiaries                 (68,826) (30,089) (91,458)
Stock-based compensation expense                 10,737 9,271 8,354
Net changes in other assets and liabilities                 (17) (133) 1,622
Net cash provided by operating activities                 96,138 173,500 91,400
Financing Activities                      
Cash dividends paid                 (96,215) (102,265) (83,459)
Repayments of Junior Subordinated Debt                 0 0 8,248
Purchase and retirement of common stock                 2,522 2,792 2,677
Purchase of treasury stock                 (20,000) (50,834) 0
Proceeds from exercise of stock options and employee stock purchase plan                 2,028 2,025 1,857
Net cash provided by financing activities                 (116,709) (153,866) (92,527)
Increase (decrease) in cash and cash equivalents                 (20,571) 19,634 (1,127)
Cash and cash equivalents at beginning of period       $ 27,805       $ 8,171 27,805 8,171 9,298
Cash and cash equivalents at end of period $ 7,234       $ 27,805       $ 7,234 $ 27,805 $ 8,171