Loans Receivable Aging Analysis (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Loan portfolio aging analysis
Accruing loans 30-59 days past due	$ 21,294	$ 17,454
Accruing loans 60-89 days past due	5,107	9,643
Accruing loans 90 days or more past due	174	1,479
Non-accrual loans	88,293	96,933
Total past due and non-accrual loans	114,868	125,509
Current loans receivable	3,886,231	3,271,916
Total loans receivable	4,001,099	3,397,425
Residential Real Estate
Loan portfolio aging analysis
Accruing loans 30-59 days past due	516	3,897
Accruing loans 60-89 days past due	824	1,870
Accruing loans 90 days or more past due	0	451
Non-accrual loans	12,604	14,237
Total past due and non-accrual loans	13,944	20,455
Current loans receivable	569,873	496,012
Total loans receivable	583,817	516,467
Commercial Real Estate
Loan portfolio aging analysis
Accruing loans 30-59 days past due	11,829	7,424
Accruing loans 60-89 days past due	2,419	3,745
Accruing loans 90 days or more past due	109	594
Non-accrual loans	53,536	55,687
Total past due and non-accrual loans	67,893	67,450
Current loans receivable	1,926,165	1,588,058
Total loans receivable	1,994,058	1,655,508
Other Commercial
Loan portfolio aging analysis
Accruing loans 30-59 days past due	5,854	2,020
Accruing loans 60-89 days past due	683	645
Accruing loans 90 days or more past due	35	197
Non-accrual loans	11,591	13,200
Total past due and non-accrual loans	18,163	16,062
Current loans receivable	816,066	607,335
Total loans receivable	834,229	623,397
Home Equity
Loan portfolio aging analysis
Accruing loans 30-59 days past due	1,828	2,872
Accruing loans 60-89 days past due	797	2,980
Accruing loans 90 days or more past due	28	188
Non-accrual loans	8,953	11,241
Total past due and non-accrual loans	11,606	17,281
Current loans receivable	361,906	386,644
Total loans receivable	373,512	403,925
Other Consumer
Loan portfolio aging analysis
Accruing loans 30-59 days past due	1,267	1,241
Accruing loans 60-89 days past due	384	403
Accruing loans 90 days or more past due	2	49
Non-accrual loans	1,609	2,568
Total past due and non-accrual loans	3,262	4,261
Current loans receivable	212,221	193,867
Total loans receivable	$ 215,483	$ 198,128