Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Securities available-for-sale, amortized cost	$ 1,277,358	$ 1,222,143
Securities held-to-maturity, fair value	$ 152,986	$ 187,402
Preferred Stock, Shares Authorized	200,000	200,000
Preferred Stock, Shares Issued	0	0
Common stock no par value
Common stock shares authorized	20,000,000	20,000,000
Common stock shares issued	16,150,902	16,150,941
Treasury stock shares	758,489	738,989