Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 178,550	$ 150,310
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	12,295	38,707
Depreciation and amortization of premises and equipment	20,984	21,423
Amortization of tax credit investments	24,608	25,093
Net amortization of investment securities premiums	6,861	6,153
Investment securities gains, net	(4,733)	(37)
Gain on sales of mortgage loans held for sale	(13,822)	(10,158)
Proceeds from sales of mortgage loans held for sale	672,314	608,561
Originations of mortgage loans held for sale	(665,338)	(594,398)
Amortization of intangible assets	1,285	0
Amortization of issuance costs and discounts on long-term debt	632	606
Stock-based compensation	5,458	6,007
Other changes, net	(195,560)	(19,576)
Total adjustments	(135,016)	82,381
Net cash provided by operating activities	43,534	232,691
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	697,634	54,638
Proceeds from principal repayments and maturities of securities held to maturity	62,320	15,475
Proceeds from principal repayments and maturities of securities available for sale	169,380	237,624
Purchase of securities available for sale	(838,634)	(459,799)
Purchase of Federal Reserve Bank and Federal Home Loan Bank stock	(15,274)	(5,165)
Net increase in loans and leases	(529,974)	(200,526)
Net change in tax credit investments	(23,799)	(29,857)
Net cash paid for acquisition	(3,907)	0
Net change in tax credit investments	14,715	47,096
Net cash used in by investing activities	(496,969)	(434,706)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	627,958	342,080
Net increase in time deposits	338,600	109,402
Increase (decrease) in short-term borrowings	78,083	(131,959)
Additions to long-term debt	305,000	50,000
Repayments of long-term debt	(571,197)	(100,122)
Net proceeds from issuance of common stock	3,813	4,748
Dividends paid	(64,439)	(61,539)
Acquisition of treasury stock	(111,457)	0
Net cash provided by financing activities	606,361	212,610
Net Increase in Cash and Cash Equivalents	152,926	10,595
Cash and Cash Equivalents at Beginning of Period	445,687	402,096
Cash and Cash Equivalents at End of Period	598,613	412,691
Cash paid during the period for:
Interest	134,935	88,559
Income taxes	7,966	8,178
Transfer of available for sale securities to held to maturity securities	0	641,672
Transfer of held to maturity securities to available for sale securities	$ 158,898	$ 0