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Other Borrowings (Narrative) (Details)
3 Months Ended 12 Months Ended
May 10, 2016
USD ($)
Apr. 20, 2011
USD ($)
Sep. 30, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
subsidiary
Dec. 31, 2015
USD ($)
Feb. 05, 2016
USD ($)
Dec. 15, 2015
USD ($)
Dec. 17, 2014
USD ($)
Debt Instrument [Line Items]                
FHLB stock, required collateral       $ 9,900,000 $ 9,600,000      
Additional collateral, aggregate fair value       2,740,000,000 2,100,000,000      
FHLB borrowing capacity       1,150,000,000        
Long-term debt       $ 288,534,000 263,214,000      
Number of wholly-owned trust subsidiaries that issue preferred securities | subsidiary       8        
Senior notes       $ 16,000,000 16,000,000      
Borrowing capacity         20,000,000      
Amount of debt     $ 1,400,000          
Common Stock                
Debt Instrument [Line Items]                
Number of shares issued upon conversion (in shares) | shares     52,913          
CIC Bancshares, Inc.                
Debt Instrument [Line Items]                
Deferred issuance costs       44,000        
CIC Bancshares, Inc. | Common Stock                
Debt Instrument [Line Items]                
Number of shares issued upon conversion (in shares) | shares     52,913          
Nonrevolving Credit Facility                
Debt Instrument [Line Items]                
Borrowing capacity             $ 50,000,000  
Available borrowings       27,100,000        
Line of credit outstanding     $ 0 0        
Interest Rate Swap                
Debt Instrument [Line Items]                
Amount of hedged debt $ 40,000,000              
Interest Rate Swap | Cash Flow Hedging                
Debt Instrument [Line Items]                
Amount of hedged debt       85,000,000        
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging | Nonrevolving Credit Facility                
Debt Instrument [Line Items]                
Fixed interest rate on derivative (as a percent) 2.50%              
Amount of hedged debt $ 40,000,000     37,667,000 0      
Term of derivative instrument 5 years              
Bank One | Interest Rate Swap                
Debt Instrument [Line Items]                
Fixed interest rate on derivative (as a percent)   5.14%            
Derivative maturity   5 years            
Tier 1                
Debt Instrument [Line Items]                
Subordinated notes qualified as Tier 2 capital       73,900,000        
Wholesale repurchase agreements                
Debt Instrument [Line Items]                
Long-term debt       30,000,000 30,000,000      
Trust preferred securities                
Debt Instrument [Line Items]                
Long-term debt       115,232,000 114,877,000      
Deferred issuance costs       149,000        
Trust preferred securities | Tier 1                
Debt Instrument [Line Items]                
Long-term debt       115,200,000 114,900,000      
Senior notes                
Debt Instrument [Line Items]                
Long-term debt       16,000,000 $ 16,000,000      
Stated interest rate (as a percent)         5.00%      
Prepayment of senior notes         $ 1,000,000      
Senior notes | December 1, 2015                
Debt Instrument [Line Items]                
Debt instrument, maturity amount       12,500,000        
Senior notes | February 1, 2017                
Debt Instrument [Line Items]                
Debt instrument, maturity amount       5,000,000        
Senior notes | February 1, 2018                
Debt Instrument [Line Items]                
Debt instrument, maturity amount       6,000,000        
Senior notes | February 1, 2019                
Debt Instrument [Line Items]                
Debt instrument, maturity amount       5,000,000        
Loans Payable | Bank One                
Debt Instrument [Line Items]                
Long-term debt   $ 15,000,000   0 8,900,000      
Notes payable to unaffiliated banks                
Debt Instrument [Line Items]                
Long-term debt       37,667,000 8,947,000      
Subordinated notes                
Debt Instrument [Line Items]                
Long-term debt       73,857,000 $ 73,714,000      
Stated interest rate (as a percent)               5.75%
Debt issued               $ 75,000,000
Debt discount               $ 1,100,000
Subordinated notes | CIC Bancshares, Inc.                
Debt Instrument [Line Items]                
Stated interest rate (as a percent)           8.00%    
Debt discount           $ 168,000    
Debt assumed           $ 6,000,000    
Subordinated notes | Other Assets                
Debt Instrument [Line Items]                
Unamortized debt issuance expense       $ 303,000        
Subordinated convertible notes | CIC Bancshares, Inc.                
Debt Instrument [Line Items]                
Stated interest rate (as a percent)           6.50%    
Debt discount           $ 16,000    
Debt assumed           $ 2,000,000    
Amount of debt     $ 1,400,000