Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 137,752	$ 119,475
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	16,575	8,182
Depreciation and amortization of premises and equipment	21,013	20,547
Net amortization of investment securities premiums	7,412	7,434
Investment securities gains, net	(7,139)	(1,025)
Gain on sales of mortgage loans held for sale	(10,122)	(11,967)
Proceeds from sales of mortgage loans held for sale	470,927	493,457
Originations of mortgage loans held for sale	(455,157)	(492,440)
Amortization of issuance costs on long-term debt	618	347
Stock-based compensation	3,339	4,808
Excess tax benefits from stock-based compensation	0	(58)
Increase in accrued interest receivable	(3,788)	(833)
Decrease (increase) in other assets	38,108	(9,075)
Increase in accrued interest payable	936	2,921
(Decrease) increase in other liabilities	(26,027)	2,061
Total adjustments	56,695	24,359
Net cash provided by operating activities	194,447	143,834
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	44,485	84,978
Proceeds from principal repayments and maturities of securities available for sale	321,088	426,932
Purchase of securities available for sale	(344,569)	(484,164)
Increase in short-term investments	(354,544)	(136,450)
Net increase in loans	(800,778)	(567,061)
Net purchases of premises and equipment	(24,758)	(23,021)
Net cash used in investing activities	(1,159,076)	(698,786)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand and savings deposits	1,014,697	880,795
Net increase (decrease) in time deposits	114,219	(60,633)
Decrease in short-term borrowings	(242,566)	(233,621)
Additions to long-term debt	223,251	16,000
Repayments of long-term debt	(115,114)	(603)
Net proceeds from issuance of common stock	7,037	5,468
Excess tax benefits from stock-based compensation	0	58
Dividends paid	(55,855)	(48,590)
Acquisition of treasury stock	0	(18,545)
Net cash provided by financing activities	945,669	540,329
Net Decrease in Cash and Due From Banks	(18,960)	(14,623)
Cash and Due From Banks at Beginning of Period	118,763	101,120
Cash and Due From Banks at End of Period	99,803	86,497
Cash paid during the period for:
Interest	66,992	58,632
Income taxes	$ 7,881	$ 9,404