Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 56,663	$ 49,480
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	5,100	3,970
Depreciation and amortization of premises and equipment	6,888	7,329
Amortization of tax credit investments	8,155	8,364
Net amortization of investment securities premiums	2,075	2,517
Investment securities gains, net	(65)	(19)
Gain on sales of mortgage loans held for sale	(3,122)	(2,645)
Proceeds from sales of mortgage loans held for sale	142,739	170,693
Originations of mortgage loans held for sale	(140,286)	(159,968)
Amortization of intangible assets	107	0
Amortization of issuance costs and discounts on long-term debt	211	194
Stock-based compensation	1,560	1,510
Increase in accrued interest receivable	(3,328)	(150)
Increase in other assets	(23,415)	(6,923)
Increase in accrued interest payable	690	364
Decrease in other liabilities	(15,701)	(2,890)
Total adjustments	(18,392)	22,346
Net cash provided by operating activities	38,271	71,826
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	37,660	1,444
Proceeds from principal repayments and maturities of securities held to maturity	18,687	0
Proceeds from principal repayments and maturities of securities available for sale	51,097	78,150
Purchase of securities available for sale	(143,588)	(161,944)
(Purchase) redemption of Federal Reserve Bank and Federal Home Loan Bank stock	(6,250)	3,862
Net (increase) decrease in loans and leases	(101,123)	67,928
Net change in tax credit investments	(11,363)	(14,840)
Net cash paid for acquisition	(3,907)	0
Net change in tax credit investments	8,003	20,783
Net cash (used in) provided by investing activities	(166,790)	(46,183)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in demand and savings deposits	(108,185)	(278,626)
Net increase (decrease) in time deposits	110,004	(41,803)
Increase in short-term borrowings	74,239	320,328
Additions to long-term debt	75,000	0
Repayments of long-term debt	(2,026)	(100,041)
Net proceeds from issuance of common stock	1,657	2,790
Dividends paid	(20,592)	(19,329)
Acquisition of treasury stock	(5,877)	0
Net cash provided by (used in) financing activities	124,220	(116,681)
Net Decrease in Cash and Cash Equivalents	(4,299)	(91,038)
Cash and Cash Equivalents at Beginning of Period	445,687	402,096
Cash and Cash Equivalents at End of Period	441,388	311,058
Cash paid during the period for:
Interest	40,695	26,005
Income taxes	$ 1,485	$ 154