Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	$ 8,740	$ (3,819)
Amortization of investment securities, net	6,927	5,439
Provision for depreciation	6,463	6,283
Amortization of investment securities, net	1,013	103
Amortization of prepayment penalty on long-term debt	4,711	4,618
Loan originations to be sold in secondary market	(168,255)	(205,576)
Proceeds from sale of loans in secondary market	170,703	201,616
Share-based compensation expense	2,116	1,189
OREO valuation adjustments	367	572
Gain on sale of OREO, net	(204)	(1,079)
Bank owned life insurance income	(3,790)	(3,284)
Changes in assets and liabilities:
Increase in other assets	(15,603)	(15,890)
(Decrease) increase in other liabilities	(4,502)	5,443
Net cash provided by operating activities	66,666	57,810
Proceeds from maturity of:
Available-for-sale securities	128,736	706,634
Held-to-maturity securities	12,264	19,301
Purchases of:
Available-for-sale securities	(29,684)	(473,627)
Payments to Acquire Held-to-maturity Securities	(96,293)	(61,155)
Net loan originations, portfolio loans	(95,808)	(109,114)
Investments in qualified affordable housing projects	0	(4,555)
Proceeds from the sale of OREO	2,363	6,954
Life insurance death benefits	1,037	1,050
Purchases of premises and equipment, net	(4,995)	(5,516)
Net cash (used in) provided by investing activities	(82,380)	79,972
Financing activities:
Net increase in deposits	452,366	172,017
Net decrease in short-term borrowings	(201,899)	(176,028)
Proceeds from issuance of long-term debt	150,000	0
Repayments of Subordinated Debt	(30,000)	0
Payments Related to Tax Withholding for Share-based Compensation	(347)	0
Repurchase of common shares to be held as treasury shares	(7,378)	0
Cash dividends paid	(43,122)	(43,232)
Net cash provided by (used in) financing activities	319,620	(47,243)
Increase in cash and cash equivalents	303,906	90,539
Cash and cash equivalents at beginning of year	146,446	149,459
Cash and cash equivalents at end of period	450,352	239,998
Supplemental disclosures of cash flow information:
Cash paid for interest	31,743	28,757
Cash paid for income taxes	18,690	17,460
Non cash activities:
Loans transferred to OREO	2,991	2,856
Securities acquired through payable	0	4,323
Affordable Housing Program Obligation, Period Increase (Decrease)	7,000	9,000
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	$ 3,431	$ 3,938