Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Securities Held-to-Maturity, Fair Value	$ 54,765	$ 66,853
Accumulated amortization and fair value adjustments on other intangibles	$ 11,776	$ 10,300
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	48,000,000us-gaap_CommonStockSharesAuthorized	48,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	18,266,404us-gaap_CommonStockSharesIssued	18,266,404us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	16,221,607us-gaap_CommonStockSharesOutstanding	16,287,812us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	2,044,797us-gaap_TreasuryStockShares	1,978,592us-gaap_TreasuryStockShares

Face amount or stated value per share of common stock.

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