Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net Income	$ 60,123	$ 59,656
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	5,648	1,016
Accretion of investment securities, net	4,921	2,815
Depreciation	5,362	5,489
Accretion of investment securities, net	(186)	(129)
Amortization of long-term debt prepayment penalty	4,522	3,681
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments	0	(20)
Loan originations to be sold in secondary market	(163,764)	(96,384)
Proceeds from sale of loans in secondary market	160,593	93,335
Share-based compensation expense	704	355
OREO valuation adjustments	1,273	2,026
Gain on sale of OREO, net	(1,429)	(5,458)
Gain on sale of commercial loans held for sale	(756)	0
Bank owned life insurance income	(4,538)	(3,708)
Changes in assets and liabilities:
Increase in other assets	(12,461)	(12,950)
Increase in other liabilities	(3,214)	(5,024)
Net cash provided by operating activities	53,830	42,794
Investing activities:
Proceeds from sales of Federal Home Loan Bank stock	0	8,946
Proceeds from Sale of Available-for-sale Securities	0	488
Proceeds from maturity of:
Available-for-sale securities	198,418	71,968
Held-to-maturity securities	29,148	31,712
Purchases of:
Available-for-sale securities	(180,273)	(127,522)
Payments to Acquire Held-to-maturity Securities	(6,096)	0
Payments to Acquire Other Investments	0	(1,350)
Net loan originations, portfolio loans	(174,952)	(181,197)
Proceeds from commercial loans held for sale		0
Investments in qualified affordable housing projects	(4,290)	(8,184)
Proceeds from the sale of OREO	15,189	26,622
Purchases of bank owned life insurance	(10,045)	0
Life insurance death benefits	6,034	1,574
Purchases of premises and equipment, net	(9,464)	(4,865)
Net cash used in investing activities	(135,431)	(181,808)
Financing activities:
Net increase in deposits	326,982	339,010
Net increase in short-term borrowings	1,344	26,689
Proceeds from issuance of long-term debt	25,000	50,000
Repurchase of treasury shares	(4,279)	(1,485)
Repayment of long-term debt	(79,544)	(75,537)
Cash dividends paid on common shares	(43,346)	(43,407)
Net cash provided by financing activities	226,157	295,270
Increase in cash and cash equivalents	144,556	156,256
Cash and cash equivalents at beginning of year	237,699	147,030
Cash and cash equivalents at end of period	382,255	303,286
Supplemental disclosures of cash flow information:
Cash paid for interest	28,225	29,674
Cash paid for income taxes	19,820	18,620
Non cash activities:
Loans transferred to OREO	12,845	7,825
Transfers from loans to commercial loans held for sale	144	21,985
Affordable Housing Program, New Commitments	9,000	8,000
Mortgage Loans on Real Estate [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of loans in secondary market	2,968	$ 1,906
Commercial Portfolio Segment [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of commercial loans held for sale	(756)
Purchases of:
Proceeds from commercial loans held for sale	$ 900