CONDENSED CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Available-for-sale securities, at amortized cost	$ 1,436,118	$ 1,397,458
Held-to-maturity securities, at fair value	99,258	89,036
Other borrowings, including certain amounts at fair value	$ 10,920	$ 10,961
Common Stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, shares authorized (in shares)	25,000,000	25,000,000
Common Stock, shares issued (in shares)	4,997,989	14,931,354
Treasury stock, shares (in shares)	109,098	111,436