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Fair Value Option and Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Level 3
Dec. 31, 2013
Level 3
Jun. 30, 2014
Asset-backed securities
Dec. 31, 2013
Asset-backed securities
Jun. 30, 2014
States and political subdivisions
Dec. 31, 2013
States and political subdivisions
Jun. 30, 2014
Recurring basis
Level 3
Dec. 31, 2013
Recurring basis
Level 3
Jun. 30, 2013
Recurring basis
Interest rate swap agreements net of swap credit valuation
Management estimate of credit risk exposure
Level 3
Jun. 30, 2013
Recurring basis
Interest rate swap agreements net of swap credit valuation
Management estimate of credit risk exposure
Level 3
Minimum
Jun. 30, 2013
Recurring basis
Interest rate swap agreements net of swap credit valuation
Management estimate of credit risk exposure
Level 3
Maximum
Jun. 30, 2013
Recurring basis
Interest rate swap agreements net of swap credit valuation
Management estimate of credit risk exposure
Level 3
Weighted Average of Inputs
Jun. 30, 2013
Recurring basis
Mortgage Servicing rights
Discounted Cash Flow
Level 3
Jun. 30, 2014
Recurring basis
Mortgage Servicing rights
Discounted Cash Flow
Level 3
Jun. 30, 2014
Recurring basis
Mortgage Servicing rights
Discounted Cash Flow
Level 3
Minimum
Jun. 30, 2014
Recurring basis
Mortgage Servicing rights
Discounted Cash Flow
Level 3
Maximum
Jun. 30, 2014
Recurring basis
Mortgage Servicing rights
Discounted Cash Flow
Level 3
Weighted Average of Inputs
Jun. 30, 2013
Recurring basis
Mortgage Servicing rights
Discounted Cash Flow
Level 3
Weighted Average of Inputs
Jun. 30, 2014
Recurring basis
Asset-backed securities
Level 3
Dec. 31, 2013
Recurring basis
Asset-backed securities
Level 3
Jun. 30, 2014
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Jun. 30, 2013
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Jun. 30, 2014
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Minimum
Jun. 30, 2013
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Minimum
Jun. 30, 2014
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Maximum
Jun. 30, 2013
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Maximum
Jun. 30, 2014
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Weighted Average of Inputs
Jun. 30, 2013
Recurring basis
Asset-backed securities
Discounted Cash Flow
Level 3
Weighted Average of Inputs
Jun. 30, 2014
Recurring basis
States and political subdivisions
Level 3
Dec. 31, 2013
Recurring basis
States and political subdivisions
Level 3
Quantitative information about Level 3 fair value measurements                                                                
Securities available-for-sale $ 329,814 $ 372,191 $ 137,211 $ 154,262 $ 246,437 $ 273,203 $ 15,753 $ 16,794                         $ 137,086 $ 154,137                 $ 125 $ 125
Mortgage servicing rights, fair value 5,501 5,807             5,501 5,807         5,807 5,501                                
Interest rate swap valuation, fair value                     (6)                                          
Asset-backed securities                                             $ 137,086 $ 154,137                
Discount rate (as a percent)                             10.20%   10.00% 14.00% 9.70% 10.20%                        
Prepayment speed (as a percent)                             9.70%   3.70% 33.20% 10.20% 9.70%                        
Credit risk rating & probability of default (as a percent)                       5.00% 20.00% 12.50%                                    
Credit risk premium (as a percent)                                                 0.50% 1.10% 0.80% 1.50% 0.70% 1.20%    
Liquidity Discount (as a percent)                                                 4.00% 4.50% 4.40% 5.10% 4.20% 4.90%