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Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
OPERATING ACTIVITIES |  |  |
Net income | $ 271,156 | $ 254,904 | $ 238,167
Items not requiring (providing) cash |  |  |
Stock-based compensation expense | 15,868 | 13,197 | 12,921
Deferred income taxes | 10,937 | (122) | 34,911
Changes in: |  |  |
Other assets | (33,495) | (7,480) | 31,920
Net cash provided by operating activities | 277,780 | 202,543 | 256,078
INVESTING ACTIVITIES |  |  |
Net collections (originations) of loans | 2,333,893 | 1,327,248 | 23,806
Proceeds from maturities of available-for-sale securities | 1,001,669 | 2,346,930 | 793,270
Purchases of available-for-sale securities | (5,266,148) | (4,140,963) | (1,708,948)
Net cash provided by (used in) investing activities | (2,537,736) | 1,189,869 | 604,477
FINANCING ACTIVITIES |  |  |
Proceeds from issuance of other borrowings | 0 | 0 | 25,500
Stock repurchases | 132,459 | 113,327 | 10,128
Dividends paid on preferred stock | (47) | (52) | (339)
Dividends paid on common stock | (78,845) | (74,593) | (63,921)
Retirement of preferred stock | (767) | 0 | (42,000)
Net cash provided by (used in) financing activities | 438,457 | 1,083,117 | (697,390)
INCREASE (DECREASE) IN CASH EQUIVALENTS | (1,821,499) | 2,475,529 | 163,165
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 3,472,152 | 996,623 | 833,458
CASH AND CASH EQUIVALENTS, END OF YEAR | 1,650,653 | 3,472,152 | 996,623
Parent Company |  |  |
OPERATING ACTIVITIES |  |  |
Net income | 271,156 | 254,904 | 238,167
Items not requiring (providing) cash |  |  |
Stock-based compensation expense | 15,868 | 13,197 | 12,921
Depreciation and amortization | 1,805 | 1,796 | 1,637
Deferred income taxes | 3,347 | 1,583 | (3,632)
Equity in undistributed net income of bank subsidiaries | (76,299) | 29,345 | (191,530)
Changes in: |  |  |
Other assets | (2,099) | (27,056) | 3,299
Other liabilities | 11,109 | 7,790 | (2,648)
Net cash provided by operating activities | 224,887 | 281,559 | 58,214
INVESTING ACTIVITIES |  |  |
Net collections (originations) of loans | (2,139) | 186 | 117
Net (purchases of) proceeds from premises and equipment | (83) | (7) | (23,184)
(Advances to) repayment for subsidiaries | 0 | (15,363) | 0
Proceeds from maturities of available-for-sale securities | 0 | 0 | 2,544
Purchases of available-for-sale securities | 0 | 0 | (439)
Cash paid in business combinations | (6,818) | 0 | (36,811)
Other, net | 2 | 185 | 29
Net cash provided by (used in) investing activities | (9,038) | (14,999) | (57,744)
FINANCING ACTIVITIES |  |  |
(Repayment) issuance of long-term debt, net | (1,563) | (7,442) | 2,000
(Cancellation) issuance of common stock, net | 1,460 | (3,131) | (1,077)
Stock repurchases | 132,459 | 113,327 | 10,128
Dividends paid on preferred stock | (47) | (52) | (339)
Dividends paid on common stock | (78,845) | (74,593) | (63,921)
Retirement of preferred stock | (767) | 0 | (42,000)
Net cash provided by (used in) financing activities | (212,221) | (198,545) | (115,465)
INCREASE (DECREASE) IN CASH EQUIVALENTS | 3,628 | 68,015 | (114,995)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 172,083 | 104,068 | 219,063
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 175,711 | $ 172,083 | $ 104,068

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- Definition The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period. + References No definition available. + Details
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- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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- Definition The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash outflow for reacquisition of callable preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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