Loans Receivable Aging Analysis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Loan portfolio aging analysis
Accruing loans 30-59 days past due	$ 37,787	$ 25,761
Accruing loans 60-89 days past due	5,075	6,355
Accruing loans 90 days or more past due	569	604
Non-accrual loans	78,905	81,956
Total past due and non-accrual loans	122,336	114,676
Current loans receivable	3,966,293	3,948,162
Total loans receivable	4,088,629	4,062,838
Residential Real Estate
Loan portfolio aging analysis
Accruing loans 30-59 days past due	12,313	10,367
Accruing loans 60-89 days past due	1,043	1,055
Accruing loans 90 days or more past due	146	429
Non-accrual loans	8,439	10,702
Total past due and non-accrual loans	21,941	22,553
Current loans receivable	558,365	555,036
Total loans receivable	580,306	577,589
Commercial Real Estate
Loan portfolio aging analysis
Accruing loans 30-59 days past due	14,823	7,016
Accruing loans 60-89 days past due	2,183	2,709
Accruing loans 90 days or more past due	256	0
Non-accrual loans	51,614	51,438
Total past due and non-accrual loans	68,876	61,163
Current loans receivable	2,002,156	1,988,084
Total loans receivable	2,071,032	2,049,247
Other Commercial
Loan portfolio aging analysis
Accruing loans 30-59 days past due	7,135	3,673
Accruing loans 60-89 days past due	1,245	1,421
Accruing loans 90 days or more past due	66	160
Non-accrual loans	8,640	10,139
Total past due and non-accrual loans	17,086	15,393
Current loans receivable	840,877	836,643
Total loans receivable	857,963	852,036
Home Equity
Loan portfolio aging analysis
Accruing loans 30-59 days past due	2,425	2,432
Accruing loans 60-89 days past due	186	668
Accruing loans 90 days or more past due	68	5
Non-accrual loans	7,875	7,950
Total past due and non-accrual loans	10,554	11,055
Current loans receivable	352,558	355,410
Total loans receivable	363,112	366,465
Other Consumer
Loan portfolio aging analysis
Accruing loans 30-59 days past due	1,091	2,273
Accruing loans 60-89 days past due	418	502
Accruing loans 90 days or more past due	33	10
Non-accrual loans	2,337	1,727
Total past due and non-accrual loans	3,879	4,512
Current loans receivable	212,337	212,989
Total loans receivable	$ 216,216	$ 217,501