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Parent Company Condensed Financial Statements (Condensed Statement 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
Statement of cash flows |  |  |  |  |  |  |  |  |  |  |
Net income | $ 188,215 | $ 171,416 | $ 150,380 | $ 164,024 | $ 173,018 | $ 171,302 | $ 172,349 | $ 187,032 | $ 674,035 | $ 703,701 | $ 505,624
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred income tax (benefit) expense |  |  |  |  |  |  |  |  | (21,604) | (16,470) | 33,856
Gains on sales of AFS debt and equity investment securities |  |  |  |  |  |  |  |  |  |  | (8,037)
Net change in other assets |  |  |  |  |  |  |  |  | (170,819) | (60,791) | 45,354
Net change in other liabilities |  |  |  |  |  |  |  |  | 7,012 | 88,070 | (1,965)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 735,829 | 883,172 | 703,275
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net increase in investments in tax credit investments |  |  |  |  |  |  |  |  | (146,902) | (132,605) | (173,630)
Proceeds from distributions received from equity method investees |  |  |  |  |  |  |  |  | 9,502 | 5,185 | 8,387
Other investing activities |  |  |  |  |  |  |  |  | 2,560 | 4,035 | (19,969)
AFS investment securities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales available-for sale debt securities |  |  |  |  |  |  |  |  | 627,110 | 364,270 |
Proceeds from sales of available-for sale securities |  |  |  |  |  |  |  |  |  |  | 832,844
Purchases of available-for-sale debt securities |  |  |  |  |  |  |  |  | (2,303,317) | (888,673) |
Purchases of available-for-sale securities |  |  |  |  |  |  |  |  |  |  | (828,604)
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (2,571,176) | (3,832,412) | (2,506,824)
Common stock: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance pursuant to various stock compensation plans and agreements |  |  |  |  |  |  |  |  | 3,383 | 2,846 | 2,280
Stocks tendered for payment of withholding taxes |  |  |  |  |  |  |  |  | (14,635) | (15,634) | (12,940)
Cash dividends paid |  |  |  |  |  |  |  |  | (155,107) | (125,988) | (116,820)
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | 2,124,962 | 3,800,808 | 2,068,460
NET INCREASE IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 259,772 | 826,785 | 296,089
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR |  |  |  | 3,001,377 |  |  |  | 2,174,592 | 3,001,377 | 2,174,592 | 1,878,503
CASH AND CASH EQUIVALENTS, END OF YEAR | 3,261,149 |  |  |  | 3,001,377 |  |  |  | 3,261,149 | 3,001,377 | 2,174,592
Parent Company |  |  |  |  |  |  |  |  |  |  |
Statement of cash flows |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 674,035 | 703,701 | 505,624
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings of subsidiaries, principally bank |  |  |  |  |  |  |  |  | (498,569) | (554,070) | (245,262)
Amortization expenses |  |  |  |  |  |  |  |  | 8,703 | 671 | 6,158
Deferred income tax (benefit) expense |  |  |  |  |  |  |  |  | (10,132) | 3,517 | 940
Gains on sales of AFS debt investment securities |  |  |  |  |  |  |  |  | 0 | 0 |
Gains on sales of AFS debt and equity investment securities |  |  |  |  |  |  |  |  |  |  | (326)
Net change in other assets |  |  |  |  |  |  |  |  | 10,246 | (595) | (3,341)
Net change in other liabilities |  |  |  |  |  |  |  |  | (18) | (45) | (560)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 184,265 | 153,179 | 263,233
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net increase in investments in tax credit investments |  |  |  |  |  |  |  |  | (292) | (1,049) | (11,591)
Proceeds from distributions received from equity method investees |  |  |  |  |  |  |  |  | 2,577 | 1,491 | 1,814
Investments in and advances to nonbank subsidiaries |  |  |  |  |  |  |  |  | (3,314) | 0 | 0
Other investing activities |  |  |  |  |  |  |  |  | (157) | 0 | 0
AFS investment securities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales available-for sale debt securities |  |  |  |  |  |  |  |  | 0 | 0 |
Proceeds from sales of available-for sale securities |  |  |  |  |  |  |  |  |  |  | 18,326
Purchases of available-for-sale debt securities |  |  |  |  |  |  |  |  | 0 | 0 |
Purchases of available-for-sale securities |  |  |  |  |  |  |  |  |  |  | (9,000)
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (1,186) | 442 | (451)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | (25,000) | (15,000)
Common stock: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance pursuant to various stock compensation plans and agreements |  |  |  |  |  |  |  |  | 3,383 | 2,846 | 2,280
Stocks tendered for payment of withholding taxes |  |  |  |  |  |  |  |  | (14,635) | (15,634) | (12,940)
Cash dividends paid |  |  |  |  |  |  |  |  | (155,107) | (125,988) | (116,820)
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (166,359) | (163,776) | (142,480)
NET INCREASE IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 16,720 | (10,155) | 120,302
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR |  |  |  | $ 149,411 |  |  |  | $ 159,566 | 149,411 | 159,566 | 39,264
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 166,131 |  |  |  | $ 149,411 |  |  |  | $ 166,131 | $ 149,411 | $ 159,566

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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=118932676&loc=SL94080555-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: 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=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + 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=118954083&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from sale 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=118954083&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=118932676&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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