Consolidated Statements Of Condition (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Preferred stock, no par value
Preferred stock, 20,000,000 shares authorized	20,000,000us-gaap_PreferredStockSharesAuthorized	20,000,000us-gaap_PreferredStockSharesAuthorized	20,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, no par value
Common stock, $1.00 stated value	$ 1.00	$ 1.00	$ 1.00
Common stock, 100,000,000 shares authorized	100,000,000us-gaap_CommonStockSharesAuthorized	100,000,000us-gaap_CommonStockSharesAuthorized	100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	47,474,721us-gaap_CommonStockSharesIssued	46,881,108us-gaap_CommonStockSharesIssued	46,332,213us-gaap_CommonStockSharesIssued
Treasury stock, shares	85,113us-gaap_TreasuryStockShares	76,053us-gaap_TreasuryStockShares	73,253us-gaap_TreasuryStockShares
Series C - $1,000 liquidation value; 126,427 shares issued and outstanding at March 31, 2015, 126,467 shares issued and outstanding at December 31, 2014, and 126,477 shares issued and outstanding at March 31, 2014
Preferred stock, $1,000 liquidation value	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares outstanding	126,427	126,467	126,477

Face amount per share of no-par value common stock.

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