Consolidated Condensed Statements Of Cash Flows - Scenario, Unspecified [Domain] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net Income	$ 40,083	$ 41,387
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	3,244	(3,485)
Accretion of investment securities, net	3,243	1,869
Depreciation	3,457	3,713
Accretion of investment securities, net	(130)	(98)
Amortization of long-term debt prepayment penalty	3,004	2,449
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments	0	(20)
Loan originations to be sold in secondary market	(82,756)	(58,978)
Proceeds from sale of loans in secondary market	80,593	55,205
Share-based compensation expense	470	220
OREO valuation adjustments	555	1,091
Gain on sale of OREO, net	(1,186)	(3,309)
Gain on sale of commercial loans held for sale	(756)	0
Bank owned life insurance income	(2,964)	(2,288)
Changes in assets and liabilities:
Decrease in other assets	(19,117)	(16,809)
Increase (decrease) in other liabilities	8,725	962
Net cash provided by operating activities	34,674	20,771
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	111,481	45,112
Held-to-maturity securities	19,035	19,757
Purchases of:
Available-for-sale securities	(180,273)	(29,558)
Payments to Acquire Other Investments	0	(1,350)
Net loan originations, portfolio loans	(76,362)	(112,572)
Proceeds from commercial loans held for sale		0
Investments in qualified affordable housing projects	(4,289)	(8,184)
Proceeds from the sale of OREO	12,169	19,172
Purchases of bank owned life insurance	(10,045)	0
Life insurance death benefits	5,221	744
Purchases of premises and equipment, net	(6,703)	(3,319)
Net cash used in investing activities	(128,866)	(60,764)
Financing activities:
Net increase in deposits	384,366	137,217
Net (decrease) increase in short-term borrowings	(38,362)	8,660
Proceeds from issuance of long-term debt	25,000	25,000
Repurchase of treasury shares	(1,783)	(1,485)
Repayment of long-term debt	(79,544)	(50,525)
Cash dividends paid on common shares	(28,898)	(28,938)
Net cash provided by financing activities	260,779	89,929
Increase in cash and cash equivalents	166,587	49,936
Cash and cash equivalents at beginning of year	237,699	147,030
Cash and cash equivalents at end of period	404,286	196,966
Supplemental disclosures of cash flow information:
Cash paid for interest	18,891	19,816
Cash paid for income taxes	8,700	11,200
Non cash activities:
Loans transferred to OREO	11,101	6,292
Transfers from loans to commercial loans held for sale	144	0
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	1,791	$ 1,138
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