Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	$ 1,646	$ 5,457
Amortization of investment securities, net	(3,055)	(2,821)
Provision for depreciation	4,294	4,284
Amortization of investment securities, net	656	597
Gain (Loss) on Sale of Investments	2,271	0
Unrealized gain loss on equity securities	(3,793)	0
Amortization of prepayment penalty on long-term debt	0	3,107
Loan originations to be sold in secondary market	(96,290)	(106,685)
Proceeds from sale of loans in secondary market	94,550	107,046
Share-based compensation expense	2,017	1,389
OREO valuation adjustments	321	345
Gain on sale of OREO, net	(4,174)	(153)
Bank owned life insurance income	(2,040)	(2,217)
Amortization Method Qualified Affordable Housing Project Investments, Amortization	3,702	3,728
Changes in assets and liabilities:
Decrease (increase) in other assets	2,667	(3,179)
Increase (decrease) in other liabilities	1,731	(4,394)
Net cash provided by operating activities	60,522	40,006
Investing activities:
Proceeds from Sale of Available-for-sale Securities	244,398	0
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Available-for-sale securities	97,008	83,308
Held-to-maturity securities	9,885	9,371
Payments to Acquire Investments [Abstract]
Payments to Acquire Held-to-maturity Securities	(4,946)	(72,258)
Available-for-sale securities	(373,372)	(14,965)
Payments to Acquire Available-for-sale Securities, Equity	(2,590)	0
Net loan originations, portfolio loans	53,162	(94,207)
Proceeds from the sale of OREO	11,461	1,688
Life insurance death benefits	1,379	74
Purchases of premises and equipment, net	(3,950)	(2,474)
Net cash provided by (used in) investing activities	32,435	(89,463)
Financing activities:
Net increase in deposits	198,518	439,620
Net decrease in short-term borrowings	(175,150)	(211,007)
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)	(5,425)
Cash dividends paid	(32,884)	(28,751)
Net cash (used in) provided by financing activities	(115,910)	314,090
Increase in cash and cash equivalents	(22,953)	264,633
Cash and cash equivalents at beginning of year	169,112	146,446
Cash and cash equivalents at end of period	146,159	411,079
Supplemental disclosures of cash flow information:
Cash paid for interest	18,766	20,258
Cash paid for income taxes	2,500	11,220
Non cash activities:
Loans transferred to OREO	861	2,891
Affordable Housing Program Obligation, Period Increase (Decrease)	0	7,000
Consumer Portfolio Segment [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Increase (Decrease) in Prepaid Expense	(1,079)	(3,734)
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	$ 2,266	$ 2,063