Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 85,597	$ 87,363
Nonaccrual Restructured Loans	35,232	37,684
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	28,908	29,293
Nonaccrual Restructured Loans	2,711	1,714
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,693	7,877
Nonaccrual Restructured Loans	2,689	2,703
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	20,993	21,915
Nonaccrual Restructured Loans	1,356	3,936
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	386	510
Nonaccrual Restructured Loans	182	177
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	19,807	19,870
Nonaccrual Restructured Loans	23,845	24,592
Home Equity Portfolio Segments [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	6,917	7,069
Nonaccrual Restructured Loans	4,416	4,522
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	893	829
Nonaccrual Restructured Loans	$ 33	$ 40