CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows From Operating Activities:
Net income	$ 5,539us-gaap_NetIncomeLoss	$ 5,811us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,081	1,977
Net gains on sales of securities	(949)us-gaap_GainLossOnSaleOfSecuritiesNet
Stock-based compensation expense	517us-gaap_ShareBasedCompensation	519us-gaap_ShareBasedCompensation
Increase in income tax liability	31	365
Increase in pension liability	1,210	587
Other operating activities, net	1,475	(479)
Net cash provided by operating activities	9,904	8,780
Cash Flows From Investing Activities:
Proceeds from sales of securities available-for-sale	45,198
Proceeds from maturities of securities available-for-sale	7,810	4,080
Purchase of securities available-for-sale	(19,297)	(8,954)
Net increase in loans	(14,187)	(12,759)
Increase in payments in excess of funding	(5,345)	(23,022)
Purchases of premises and equipment, net	(1,624)	(907)
Net cash provided by (used in) investing activities	12,555	(41,562)
Cash Flows From Financing Activities:
Net increase in noninterest-bearing demand deposits	1,556	15,546
Net decrease in interest-bearing demand and savings deposits	(614)	(18,770)
Net (decrease) increase in time deposits	(4,063)us-gaap_IncreaseDecreaseInTimeDeposits	1,931us-gaap_IncreaseDecreaseInTimeDeposits
Net (decrease) increase in accounts and drafts payable	(98,602)	10,742
Cash dividends paid	(2,412)us-gaap_PaymentsOfDividendsCommonStock	(2,306)us-gaap_PaymentsOfDividendsCommonStock
Purchase of common shares for treasury	(3,358)
Other financing activities, net	(786)	(462)
Net cash (used in) provided by financing activities	(108,279)	6,681
Net decrease in cash and cash equivalents	(85,820)	(26,101)
Cash and cash equivalents at beginning of period	294,335	225,262
Cash and cash equivalents at end of period	208,515	199,161
Supplemental information:
Cash paid for interest	582us-gaap_InterestPaidNet	618us-gaap_InterestPaidNet
Cash paid for income taxes	$ 1,942us-gaap_IncomeTaxesPaidNet	$ 1,323us-gaap_IncomeTaxesPaidNet

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