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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, 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
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 636,385
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 46,129 | $ 50,727 | $ 51,724 | $ 45,871 | $ 44,748 | $ 46,415 | $ 41,749 | $ 39,970 | 194,451 | 172,882 | 112,828
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 9,271 | 8,354 | 7,745
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 204,747 | 237,201 | 128,525
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net cash paid in business combinations |  |  |  |  |  |  |  |  | 0 | 0 | 80,472
Net cash provided by investing activities |  |  |  |  |  |  |  |  | (865,450) | (506,083) | (199,489)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (101,911) | (83,440) | (51,308)
Repayments of Junior Subordinated Debt |  |  |  |  |  |  |  |  | 0 | 8,248 | 6,186
Payments for cash settlement of acquired equity awards |  |  |  |  |  |  |  |  | 0 | 0 | (7,345)
Purchase and retirement of common stock |  |  |  |  |  |  |  |  | 2,792 | 2,677 | 2,299
Purchase of treasury stock |  |  |  |  |  |  |  |  | (50,834) | 0 | 0
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 2,025 | 1,857 | 1,980
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 630,789 | 203,936 | 189,259
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (29,914) | (64,946) | 118,295
Cash and cash equivalents at beginning of period |  |  |  | 277,587 |  |  |  | 342,533 | 277,587 | 342,533 | 224,238
Cash and cash equivalents at end of period | 247,673 |  |  |  | 277,587 |  |  |  | 247,673 | 277,587 | 342,533
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued |  |  |  |  |  |  |  |  | 0 | 0 | 636,385
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 194,451 | 172,882 | 112,828
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (30,089) | (91,458) | (49,656)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 9,271 | 8,354 | 7,745
Net changes in other assets and liabilities |  |  |  |  |  |  |  |  | (133) | 1,622 | 1,672
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 173,500 | 91,400 | 72,589
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net cash paid in business combinations |  |  |  |  |  |  |  |  | 0 | 0 | (580)
Net cash provided by investing activities |  |  |  |  |  |  |  |  | 0 | 0 | (580)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (102,265) | (83,459) | (51,308)
Repayments of Junior Subordinated Debt |  |  |  |  |  |  |  |  | 0 | 8,248 | 6,186
Payments for cash settlement of acquired equity awards |  |  |  |  |  |  |  |  | 0 | 0 | 7,345
Purchase and retirement of common stock |  |  |  |  |  |  |  |  | 2,792 | 2,677 | 2,299
Purchase of treasury stock |  |  |  |  |  |  |  |  | (50,834) | 0 | 0
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 2,025 | 1,857 | 1,980
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (153,866) | (92,527) | (65,158)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 19,634 | (1,127) | 6,851
Cash and cash equivalents at beginning of period |  |  |  | $ 8,171 |  |  |  | $ 9,298 | 8,171 | 9,298 | 2,447
Cash and cash equivalents at end of period | $ 27,805 |  |  |  | $ 8,171 |  |  |  | $ 27,805 | $ 8,171 | $ 9,298

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