Loans Receivable, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for loan and lease losses
Balance at beginning of period	$ 137,516	$ 137,107	$ 142,927
Provision for loan losses	21,525	64,500	84,693
Charge-offs	(34,672)	(69,366)	(93,950)
Recoveries	6,485	5,275	3,437
Balance at end of period	130,854	137,516	137,107
Residential Real Estate [Member]
Allowance for loan and lease losses
Balance at beginning of period	17,227	20,957
Provision for loan losses	2,879	1,455
Charge-offs	(5,267)	(5,671)
Recoveries	643	486
Balance at end of period	15,482	17,227
Commercial Real Estate [Member]
Allowance for loan and lease losses
Balance at beginning of period	76,920	76,147
Provision for loan losses	11,012	39,563
Charge-offs	(16,339)	(42,042)
Recoveries	2,805	3,252
Balance at end of period	74,398	76,920
Other Commercial [Member]
Allowance for loan and lease losses
Balance at beginning of period	20,833	19,932
Provision for loan losses	4,690	10,709
Charge-offs	(5,239)	(10,386)
Recoveries	1,283	578
Balance at end of period	21,567	20,833
Home Equity [Member]
Allowance for loan and lease losses
Balance at beginning of period	13,616	13,334
Provision for loan losses	324	4,450
Charge-offs	(4,369)	(4,644)
Recoveries	1,088	476
Balance at end of period	10,659	13,616
Other Consumer [Member]
Allowance for loan and lease losses
Balance at beginning of period	8,920	6,737
Provision for loan losses	2,620	8,323
Charge-offs	(3,458)	(6,623)
Recoveries	666	483
Balance at end of period	$ 8,748	$ 8,920