Allowance for Loan Losses Allowance Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							$ 84,057								$ 96,114		$ 84,057	$ 96,114	$ 98,403
Provision/ (credit) for loan losses	(2,000)	[1]	(6,000)	[1]	(2,000)	[1]	0	[1]	(5,000)	[1]	(4,000)	[1]	1,700	[1]	4,000	[1]	(10,000)	(3,300)	13,160
Financing Receivable, Allowance for Credit Losses, Write-downs																	(5,417)	(17,185)	(27,424)
Financing Receivable, Allowance for Credit Losses, Recovery																	7,731	8,428	11,975
Loans and Leases Receivable, Allowance, End of Period	76,371								84,057								76,371	84,057	96,114
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							11,825								12,163		11,825	12,163	13,438
Provision/ (credit) for loan losses																	11	2,819	(2,219)
Financing Receivable, Allowance for Credit Losses, Write-downs																	(218)	(4,968)	(3,257)
Financing Receivable, Allowance for Credit Losses, Recovery																	1,219	1,811	4,201
Loans and Leases Receivable, Allowance, End of Period	12,837								11,825								12,837	11,825	12,163
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							52,497								63,625		52,497	63,625	65,760
Provision/ (credit) for loan losses																	(10,024)	(6,325)	11,718
Financing Receivable, Allowance for Credit Losses, Write-downs																	(2,712)	(8,306)	(16,521)
Financing Receivable, Allowance for Credit Losses, Recovery																	5,218	3,503	2,668
Loans and Leases Receivable, Allowance, End of Period	44,979								52,497								44,979	52,497	63,625
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							5,016								6,382		5,016	6,382	6,875
Provision/ (credit) for loan losses																	(1,683)	(3,081)	(901)
Financing Receivable, Allowance for Credit Losses, Write-downs																	(100)	(710)	(4,530)
Financing Receivable, Allowance for Credit Losses, Recovery																	1,232	2,425	4,938
Loans and Leases Receivable, Allowance, End of Period	4,465								5,016								4,465	5,016	6,382
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							10,892								9,286		10,892	9,286	7,449
Provision/ (credit) for loan losses																	1,824	4,078	3,244
Financing Receivable, Allowance for Credit Losses, Write-downs																	(2,008)	(2,944)	(1,507)
Financing Receivable, Allowance for Credit Losses, Recovery																	24	472	100
Loans and Leases Receivable, Allowance, End of Period	10,732								10,892								10,732	10,892	9,286
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							1,085								1,535		1,085	1,535	1,231
Provision/ (credit) for loan losses																	271	(389)	1,183
Financing Receivable, Allowance for Credit Losses, Write-downs																	(360)	(129)	(891)
Financing Receivable, Allowance for Credit Losses, Recovery																	24	68	12
Loans and Leases Receivable, Allowance, End of Period	1,020								1,085								1,020	1,085	1,535
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							540								1,149		540	1,149	1,478
Provision/ (credit) for loan losses																	(213)	(630)	333
Financing Receivable, Allowance for Credit Losses, Write-downs																	(19)	(128)	(718)
Financing Receivable, Allowance for Credit Losses, Recovery																	14	149	56
Loans and Leases Receivable, Allowance, End of Period	322								540								322	540	1,149
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning of Period							2,202								1,974		2,202	1,974	2,172
Provision/ (credit) for loan losses																	(186)	228	(198)
Loans and Leases Receivable, Allowance, End of Period	$ 2,016								$ 2,202								$ 2,016	$ 2,202	$ 1,974

[1] Due to rounding, the sum of the four quarters may not add to the year to date total.