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Parent Company Cash Flow Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net income |  | $ 120,992 | $ 121,167 |  | $ 165,175
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Deferred income tax expense |  | 3,090 | (17,506) |  | 10,594
Change in other liabilities |  | (58,503) | 76,140 |  | 19,283
Net cash provided by operating activities |  | 190,220 | 64,636 |  | 216,522
Cash flows provided by (used) in investing activities |  |  |  |  |
Net cash used in investing activities |  | (63,136) | (488,211) |  | 20,160
Cash flows provided by (used in) financing activities |  |  |  |  |
Proceeds from Lines of Credit |  | 0 | 0 |  | 49,980
Repayments of Lines of Credit |  | 0 | 0 |  | (49,980)
Proceeds from Issuance of Subordinated Long-term Debt |  | 0 | 0 |  | 49,526
Repayments of Subordinated Debt |  | 0 | 0 |  | (34,767)
Cash received from stock option exercises |  |  | 197 |  | 281
Proceeds from shares issued under the direct stock purchase plan |  | 2,023 | 2,132 |  | 4,951
Common dividends paid |  | (62,736) | (60,840) |  | (53,274)
Net cash provided by (used in) financing activities |  | 816,964 | 1,569,237 |  | (336,163)
Cash and cash equivalents at beginning of year |  | 1,296,636 | 150,974 |  | 250,455
Cash and cash equivalents at end of period |  | 2,240,684 | 1,296,636 |  | 150,974
Payments for Repurchase of Common Stock |  | 0 | (95,091) |  | 0
RepaymentsOfJuniorSubordinatedDebt |  | 0 | 0 |  | (13,329)
Repayments of Long-term Debt |  | (18,750) | (42,187) |  |
Proceeds from Issuance of Debt |  |  |  |  | 74,867
Net payments from exercise of stock options |  | 57 |  |  |
Parent Company [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Investments in subsidiaries | [1] | 2,952,089 | 1,761,383 |  |
Net income |  | 120,992 | 121,167 |  | 165,175
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |
Amortization |  | 137 | 152 |  | 157
Deferred income tax expense |  | 12 | 284 |  | 1,021
Change in prepaid income taxes and other assets |  | (229) | (475) | [2] | 20,556
Change in other liabilities |  | (1,873) | (169) |  | (4,613)
Equity (deficit) in undistributed income of subsidiaries |  | 46,571 | (40,933) |  | (10,641)
Net cash provided by operating activities |  | 72,468 | 161,892 |  | 192,937
Cash flows provided by (used) in investing activities |  |  |  |  |
Net cash acquired (paid) in business combinations |  | 119,816 | 0 |  | (148,297)
Net cash used in investing activities |  | 119,816 | 0 |  | (148,297)
Cash flows provided by (used in) financing activities |  |  |  |  |
Proceeds from Lines of Credit |  | 0 | 0 |  | 49,980
Repayments of Lines of Credit |  | 0 | 0 |  | (49,980)
Proceeds from Issuance of Subordinated Long-term Debt |  | 0 | 0 |  | 49,526
Restricted stock awards issued, net of awards surrendered |  | (1,249) | (1,187) |  | (1,463)
Cash received from stock option exercises |  |  | 197 |  | 281
Proceeds from shares issued under the direct stock purchase plan |  | 2,023 | 2,132 |  | 4,951
Common dividends paid |  | (62,736) | (60,840) |  | (53,274)
Net cash provided by (used in) financing activities |  | (80,769) | (196,976) |  | 26,792
Net increase (decrease) in cash and cash equivalents |  | 111,515 | (35,084) |  | 71,432
Cash and cash equivalents at beginning of year |  | 100,604 | 135,688 |  | 64,256
Cash and cash equivalents at end of period |  | 212,119 | 100,604 |  | 135,688
Cash | [3] | 212,119 | 100,604 |  |
Payments for Repurchase of Common Stock |  | 0 | (95,091) |  | 0
RepaymentsOfJuniorSubordinatedDebt |  | 0 | 0 |  | (13,329)
Repayments of Long-term Debt |  | (18,750) | (42,187) |  |
Proceeds from Issuance of Debt |  |  |  |  | 74,867
Reallocation of tax asset from parent to bank subsidiary, noncash adjustment |  |  | 30,100 |  |
Net payments from exercise of stock options |  | (57) |  |  |
Subordinated Debt [Member] | Parent Company [Member] |  |  |  |  |
Cash flows provided by (used in) financing activities |  |  |  |  |
Repayments of Subordinated Debt |  | $ 0 | $ 0 |  | $ (34,767)
[1] | Majority of balance eliminates in consolidation
[2] | Reflected in this line for the year ended December 31, 2020 is a noncash adjustment which decreased prepaid income taxes and increased investment in subsidiary by $30.1 million, which represents a reallocation of a tax asset from the parent to the bank subsidiary.
[3] | Entire balance eliminates in consolidation.

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