CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 33,188	$ 17,348	$ 13,615
Other comprehensive income (loss), before tax:
Changes in unrealized gains and losses on securities available-for-sale	4,419	2,329	(116)
Changes in unrealized gains and losses on derivative hedges	(2,072)	341	319
Changes in unrealized gains and losses on terminated swaps	941	942	(6,063)
Changes in unrealized gains and losses on pension	(135)	(1,130)
Total other comprehensive income (loss), before tax	3,153	2,482	(5,860)
Income taxes related to other comprehensive income (loss):
Changes in unrealized gains and losses on securities available-for-sale	(1,668)	(870)	42
Changes in unrealized gains and losses on derivative hedges	689	(151)	(140)
Changes in unrealized gains and losses on terminated swaps	(324)	(391)	2,516
Changes in unrealized gains and losses on pension	56	455
Total income tax (benefit) expense related to other comprehensive income (loss)	(1,247)	(957)	2,418
Total other comprehensive income (loss)	1,906	1,525	(3,442)
Total comprehensive income	$ 35,094	$ 18,873	$ 10,173