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Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
OPERATING ACTIVITIES |  |  |
Net income | $ 254,904 | $ 238,167 | $ 215,713
Items not requiring (providing) cash |  |  |
Stock-based compensation expense | 13,197 | 12,921 | 9,725
Deferred income taxes | (122) | 34,911 | 8,412
Changes in: |  |  |
Other assets | (7,480) | 31,920 | (35,113)
Net cash provided by operating activities | 202,543 | 256,078 | 226,980
INVESTING ACTIVITIES |  |  |
Net collections (originations) of loans | 1,327,248 | 23,806 | (912,793)
Proceeds from maturities of available-for-sale securities | 2,346,930 | 793,270 | 258,182
Purchases of available-for-sale securities | (4,140,963) | (1,708,948) | (784,113)
Net cash provided by (used in) investing activities | 1,189,869 | 604,477 | (1,395,122)
FINANCING ACTIVITIES |  |  |
Proceeds from issuance of subordinated notes and other borrowings | 0 | 25,500 | 326,355
Stock repurchases | 113,327 | 10,128 | 0
Dividends paid on preferred stock | (52) | (339) | 0
Dividends paid on common stock | (74,593) | (63,921) | (55,646)
Retirement of preferred stock | 0 | (42,000) | 0
Net cash provided by (used in) financing activities | 1,083,117 | (697,390) | 1,403,558
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 996,623 | 833,458 | 598,042
CASH AND CASH EQUIVALENTS, END OF YEAR | 3,472,152 | 996,623 | 833,458
Parent Company |  |  |
OPERATING ACTIVITIES |  |  |
Net income | 254,904 | 238,167 | 215,713
Items not requiring (providing) cash |  |  |
Stock-based compensation expense | 13,197 | 12,921 | 9,725
Depreciation and amortization | 1,796 | 1,637 | 880
Deferred income taxes | 1,583 | (3,632) | 26
Equity in undistributed net income of bank subsidiaries | 29,345 | (191,530) | (91,057)
Changes in: |  |  |
Other assets | (27,056) | 3,299 | 1,524
Other liabilities | 7,790 | (2,648) | 17,340
Net cash provided by operating activities | 281,559 | 58,214 | 154,151
INVESTING ACTIVITIES |  |  |
Net collections (originations) of loans | 186 | 117 | 219
Net (purchases of) proceeds from premises and equipment | (7) | (23,184) | 3,342
(Advances to) repayment for subsidiaries | (15,363) | 0 | 2,667
Proceeds from maturities of available-for-sale securities | 0 | 2,544 | 152
Purchases of available-for-sale securities | 0 | (439) | (211)
Cash paid in business combinations | 0 | (36,811) | 0
Other, net | 185 | 29 | (1,903)
Net cash provided by (used in) investing activities | (14,999) | (57,744) | 4,266
FINANCING ACTIVITIES |  |  |
Proceeds from issuance of subordinated notes and other borrowings | 0 | 0 | 326,355
(Repayment ) issuance of long-term debt, net | (7,442) | 2,000 | (231,352)
(Cancellation) issuance of common stock, net | (3,131) | (1,077) | 2,188
Stock repurchases | 113,327 | 10,128 | 0
Dividends paid on preferred stock | (52) | (339) | 0
Dividends paid on common stock | (74,593) | (63,921) | (55,646)
Retirement of preferred stock | 0 | (42,000) | 0
Net cash provided by (used in) financing activities | (198,545) | (115,465) | 41,545
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 68,015 | (114,995) | 199,962
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 104,068 | 219,063 | 19,101
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 172,083 | $ 104,068 | $ 219,063

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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=121586364&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=121586364&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=121586364&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=121553693&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=121586364&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=121586364&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=121586364&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=121586364&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=121553693&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=121586364&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=121586364&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=121586364&loc=d3e3602-108585 + Details
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