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Parent Company Only Financial Information - Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities      
Net income $ 100,344 $ 102,953 $ 98,928
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 12,273 11,879 9,556
Net security losses (gains) (1,724) (733) 1,780
Stock-based compensation 7,135 3,997 3,721
Changes in assets and liabilities:      
(Increase) decrease in other assets (5,899) 5,397 9,580
Increase (decrease) in other liabilities (6,551) (7,380) 2,195
Net cash provided by (used in) operating Activities 169,299 80,800 202,547
Cash Flows from Investing Activities      
Purchases of equity securities (13,123) (550)  
Purchases of premises and equipment (4,198) (13,238) (11,618)
Net cash (used in) provided by investing activities (735,664) 64,958 (55,350)
Cash Flows from Financing Activities      
Cash paid for withholding taxes on stock-based payments (635) (863) (1,208)
Cash dividends paid (48,012) (45,171) (39,010)
Proceeds from stock options exercised 101 169 392
Purchase of treasury stock (12,272) (24,292)  
Common stock issuance costs   (234)  
Net cash provided by (used in) financing activities 725,614 143,557 (260,496)
Net increase (decrease) in cash and cash equivalents 159,249 289,315 (113,299)
Cash and cash equivalents, beginning of period 529,288 239,973 353,272
Cash and cash equivalents, ending of period 688,537 529,288 239,973
Parent      
Cash Flows from Operating Activities      
Net income 100,344 102,953 98,928
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 648 420 232
Distributions less than net income of subsidiaries 3,281 (51,961) (93,451)
Net security losses (gains) 393 759 (2,322)
Stock-based compensation 7,135 3,997 3,721
Changes in assets and liabilities:      
(Increase) decrease in other assets 405 (4,279) 13,985
Increase (decrease) in other liabilities (5,772) (1,280) 1,341
Net cash provided by (used in) operating Activities 106,434 50,609 22,434
Cash Flows from Investing Activities      
Purchases of equity securities   (520)  
Net cash paid for business acquisition   (90,722)  
Purchases of premises and equipment (19) (31) (46)
Net cash (used in) provided by investing activities (19) (91,273) (46)
Cash Flows from Financing Activities      
Proceeds from charter amendment with subsidiary bank     40,000
Cash paid for withholding taxes on stock-based payments (635) (863) (817)
Cash dividends paid (48,012) (45,171) (39,010)
Repayments of debt (74,000) (6,000) (5,500)
Proceeds from issuance of debt 142,634 60,000  
Proceeds from stock options exercised 101 169  
Purchase of treasury stock (12,272) (24,292)  
Common stock issuance costs   (234)  
Net cash provided by (used in) financing activities 7,816 (16,391) (5,327)
Net increase (decrease) in cash and cash equivalents 114,231 (57,055) 17,061
Cash and cash equivalents, beginning of period 14,952 72,007 54,946
Cash and cash equivalents, ending of period $ 129,183 $ 14,952 $ 72,007