Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Held-to-maturity securities, fair value	$ 323,056,000	$ 319,923,000
Allowance for loan losses	25,755,000	24,998,000
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 10.00	$ 10.00
Preferred stock, liquidation preference	$ 1,000,000	$ 1,000,000
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	40,000	40,000
Preferred stock, shares outstanding	40,000	40,000
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	14,292,761	14,232,844
Common stock, shares outstanding	14,163,461	14,220,544
Treasury stock, shares	129,300	12,300
Participating Preferred Stock
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 10	$ 0
Preferred stock, shares authorized	14,162
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0