CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Capital	Retained earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock
Balance at Dec. 31, 2011	$ 346,961	$ 1,806	$ 69,328	$ 318,130	$ (10,494)	$ (31,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32,812	0	0	32,812	0	0
Other comprehensive income (loss)	3,022	0	0	0	3,022	0
Contribution of shares to ESOP	488	2	486	0	0	0
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP	1,439	0	175	0	0	1,264
Cash Dividends	(12,600)	0	0	(12,600)	0	0
Balance at Dec. 31, 2012	372,122	1,808	69,989	338,342	(7,472)	(30,545)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,534	0	0	31,534	0	0
Other comprehensive income (loss)	(6,497)	0	0	0	(6,497)	0
Contribution of shares to ESOP	611	3	770	0	0	(162)
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP	1,218	0	315	0	0	903
Cash Dividends	(12,793)	0	0	(12,793)	0	0
Balance at Dec. 31, 2013	386,195	1,811	71,074	357,083	(13,969)	(29,804)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,772	0	0	33,772	0	0
Other comprehensive income (loss)	(560)	0	0	0	(560)	0
Treasury Stock, Value, Acquired, Cost Method	(14,633)	0	0	0	0	(14,633)
Contribution of shares to ESOP	1,072	4	1,068	0	0	0
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP	1,253	0	263	0	0	990
Cash Dividends	(12,885)	0	0	(12,885)	0	0
Balance at Dec. 31, 2014	$ 394,214	$ 1,815	$ 72,405	$ 377,970	$ (14,529)	$ (43,447)