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Significant Accounting Policies (Loans Acquired in a Business Combination) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Pools
May. 31, 2015
USD ($)
Apr. 01, 2015
USD ($)
Dec. 31, 2014
USD ($)
Oct. 31, 2014
USD ($)
Apr. 30, 2010
USD ($)
Receivables Acquired with Deteriorated Credit Quality [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio $ 1,463,213     $ 698,163    
Lake Michigan Financial Corp [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio   $ 947,000        
Outstanding contractual principal balance of acquired loan portfolio   1,010,000        
Number of pools of aggregate acquired loans based upon common risk characteristics | Pools 2          
Lake Michigan Financial Corp [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio   $ 63,000        
Monarch Community Bancorp [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio     $ 120,000      
Outstanding contractual principal balance of acquired loan portfolio     129,000      
Number of pools of aggregate acquired loans based upon common risk characteristics | Pools 2          
Monarch Community Bancorp [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio     $ 9,000      
OAK [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio           $ 578,000
Outstanding contractual principal balance of acquired loan portfolio           683,000
Number of pools of aggregate acquired loans based upon common risk characteristics | Pools 14          
OAK [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio           $ 105,000
Northwestern Bancorp [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio         $ 461,000  
Outstanding contractual principal balance of acquired loan portfolio         507,000  
Number of pools of aggregate acquired loans based upon common risk characteristics | Pools 4          
Northwestern Bancorp [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Business Acquisition [Line Items]            
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio         $ 46,000