Annual report pursuant to Section 13 and 15(d)

PARENT COMPANY FINANCIAL STATEMENTS - Cash Flow Statement (Details)

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PARENT COMPANY FINANCIAL STATEMENTS - Cash Flow Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities                      
Net income $ 432,000 $ 275,000 $ 272,000 $ 207,000 $ 239,000 $ 127,000 $ 175,000 $ 171,000 $ 1,186,000 $ 712,000 $ 693,000
Adjustments to reconcile net income to net cash provided by operating activities:                      
Depreciation and amortization                 413,000 380,000 341,000
Net cash provided by (used in) operating activities                 1,954,000 1,215,000 1,033,000
Investing activities                      
Sales of available-for-sale securities                 2,490,000 6,154,000 163,000
Cash paid for acquisitions, net of cash received                 0 (133,000) (458,000)
Net cash provided by (used in) investing activities                 (4,866,000) (3,445,000) (4,929,000)
Financing activities                      
Proceeds from issuance of long-term borrowings                 1,816,000 2,128,000 3,232,000
Payment of borrowings                 1,371,000 1,900,000 (1,819,000)
Net proceeds from issuance of preferred stock                 0 585,000 0
Repurchases of common stock                 (260,000) 0 (252,000)
Other, net                 0 4,000 8,000
Net cash provided by (used) financing activities                 3,047,000 2,768,000 3,522,000
Increase (decrease) in cash and cash equivalents                 135,000 538,000 (374,000)
Cash and cash equivalents at beginning of period       1,385,000       847,000 1,385,000 847,000 1,221,000
Cash and cash equivalents at end of period 1,520,000       1,385,000       1,520,000 1,385,000 847,000
Supplemental disclosures:                      
Interest paid                 409,000 241,000 150,000
Parent Company                      
Operating activities                      
Net income                 1,186,000 712,000 693,000
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed net income of subsidiaries                 (997,000) (634,000) 176,000
Depreciation and amortization                 4,000 (1,000) 1,000
Loss on sales of securities available-for-sale                 0 0 0
Other, net                 (37,000) (24,000) (45,000)
Net cash provided by (used in) operating activities                 156,000 53,000 825,000
Investing activities                      
Repayments from subsidiaries                 442,000 464,000 495,000
Advances to subsidiaries                 (29,000) (1,758,000) (612,000)
Sales of available-for-sale securities                 1,000 (2,000) 0
Cash paid for acquisitions, net of cash received                 0 (133,000) 0
Proceeds from business divestitures                 0 0 9,000
Net cash provided by (used in) investing activities                 414,000 (1,429,000) (108,000)
Financing activities                      
Proceeds from issuance of long-term borrowings                 0 1,990,000 0
Payment of borrowings                 0 (65,000) 0
Dividends paid on stock                 (425,000) (299,000) (225,000)
Net proceeds from issuance of preferred stock                 0 585,000 0
Repurchases of common stock                 (260,000) 0 (252,000)
Other, net                 (20,000) 1,000 14,000
Net cash provided by (used) financing activities                 (705,000) 2,212,000 (463,000)
Increase (decrease) in cash and cash equivalents                 (135,000) 836,000 254,000
Cash and cash equivalents at beginning of period       $ 1,753,000       $ 917,000 1,753,000 917,000 663,000
Cash and cash equivalents at end of period $ 1,618,000       $ 1,753,000       1,618,000 1,753,000 917,000
Supplemental disclosures:                      
Interest paid                 $ 90,000 $ 36,000 $ 17,000