Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	$ 4,586	$ 8,740
Amortization of investment securities, net	(4,631)	(4,352)
Provision for depreciation	6,446	6,463
Amortization of investment securities, net	932	1,013
Gain (Loss) on Sale of Investments	2,271	0
Unrealized gain loss on equity securities	(3,467)	0
Amortization of prepayment penalty on long-term debt	0	4,711
Loan originations to be sold in secondary market	(153,093)	(168,255)
Proceeds from sale of loans in secondary market	154,544	170,703
Share-based compensation expense	3,064	2,116
OREO valuation adjustments	398	367
Gain on sale of OREO, net	(4,093)	(204)
Bank owned life insurance income	(4,625)	(3,790)
Amortization Method Qualified Affordable Housing Project Investments, Amortization	5,553	5,592
Changes in assets and liabilities:
Decrease (increase) in other assets	6,575	(5,603)
Increase (decrease) in other liabilities	4,536	(4,502)
Net cash provided by operating activities	98,119	66,666
Investing activities:
Payments for (Proceeds from) Federal Home Loan Bank Stock	7,004	0
Proceeds from Sale of Available-for-sale Securities	244,399	0
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Available-for-sale securities	151,860	128,736
Held-to-maturity securities	10,102	12,264
Payments to Acquire Investments [Abstract]
Payments to Acquire Held-to-maturity Securities	(4,946)	(96,293)
Available-for-sale securities	(373,372)	(29,684)
Payments to Acquire Available-for-sale Securities, Equity	(2,590)	0
Net loan originations, portfolio loans	12,027	(95,808)
Proceeds from the sale of OREO	11,919	2,363
Life insurance death benefits	4,028	1,037
Purchases of premises and equipment	(7,145)	(4,995)
Cash Acquired from Acquisition	12,270	0
Net cash provided by (used in) investing activities	65,556	(82,380)
Financing activities:
Net increase in deposits	177,626	452,366
Net decrease in short-term borrowings	(211,471)	(201,899)
Proceeds from issuance of long-term debt	25,000	150,000
Repayments of Subordinated Debt	0	(30,000)
Repayments of Long-term Debt	(125,000)	0
Payments Related to Tax Withholding for Share-based Compensation	(610)	(347)
Repurchase of common shares to be held as treasury shares	(5,784)	(7,378)
Cash dividends paid	(47,944)	(43,122)
Net cash (used in) provided by financing activities	(188,183)	319,620
Increase in cash and cash equivalents	(24,508)	303,906
Cash and cash equivalents at beginning of year	169,112	146,446
Cash and cash equivalents at end of period	144,604	450,352
Supplemental disclosures of cash flow information:
Cash paid for interest	30,424	31,743
Cash paid for income taxes	5,525	18,690
Real Estate Owned, Transfer to Real Estate Owned	1,037
Non cash activities:
Loans transferred to OREO		2,991
Other repossessed assets, transfer to repossessed assets	11,379	0
Affordable Housing Program Obligation, Period Increase (Decrease)	8,000	7,000
Consumer Portfolio Segment [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Increase (Decrease) in Prepaid Expense	(1,399)	(4,313)
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	$ 3,604	$ 3,431

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