v2.4.0.8
Portfolio Loans - Summary of Non-covered Loans Individually Evaluated for Impairment by Category (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Past Due and Impaired Loans [Abstract]    
Number of loans over 90 days past due and still accruing (loan) 1  
Unadvanced commitments on impaired loans $ 0  
Non-Covered Loans
    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 22,488,000 24,243,000
Recorded Investment With No Allowance 4,601,000 15,122,000
Recorded Investment With Allowance 13,266,000 6,445,000
Total Recorded Investment 17,867,000 21,567,000
Related allowance 1,078,000 1,550,000
Average Recorded Investment 18,142,000 27,490,000
Past Due and Impaired Loans [Abstract]    
Loans over 90 days past due and still accruing interest 340,000 0
Non-Covered Loans | Commercial and industrial
    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 4,512,000 4,377,000
Recorded Investment With No Allowance 3,198,000 0
Recorded Investment With Allowance 0 3,384,000
Total Recorded Investment 3,198,000 3,384,000
Related allowance 404,000 736,000
Average Recorded Investment 4,037,000 6,574,000
Past Due and Impaired Loans [Abstract]    
Loans over 90 days past due and still accruing interest 340,000 0
Non-Covered Loans | Commercial real estate - Owner occupied
    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 4,876,000 606,000
Recorded Investment With No Allowance 773,000 201,000
Recorded Investment With Allowance 1,891,000 421,000
Total Recorded Investment 2,664,000 622,000
Related allowance 293,000 107,000
Average Recorded Investment 1,388,000 1,868,000
Past Due and Impaired Loans [Abstract]    
Loans over 90 days past due and still accruing interest 0 0
Non-Covered Loans | Commercial real estate - Investor owned
    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 5,164,000 8,033,000
Recorded Investment With No Allowance 0 7,190,000
Recorded Investment With Allowance 5,164,000 0
Total Recorded Investment 5,164,000 7,190,000
Related allowance 0 0
Average Recorded Investment 4,138,000 11,348,000
Past Due and Impaired Loans [Abstract]    
Loans over 90 days past due and still accruing interest 0 0
Non-Covered Loans | Construction and land development
    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 7,550,000 10,668,000
Recorded Investment With No Allowance 430,000 7,383,000
Recorded Investment With Allowance 6,026,000 2,419,000
Total Recorded Investment 6,456,000 9,802,000
Related allowance 364,000 703,000
Average Recorded Investment 7,565,000 5,770,000
Past Due and Impaired Loans [Abstract]    
Loans over 90 days past due and still accruing interest 0 0
Non-Covered Loans | Residential real estate
    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 386,000 559,000
Recorded Investment With No Allowance 200,000 348,000
Recorded Investment With Allowance 185,000 221,000
Total Recorded Investment 385,000 569,000
Related allowance 17,000 4,000
Average Recorded Investment 495,000 1,930,000
Past Due and Impaired Loans [Abstract]    
Loans over 90 days past due and still accruing interest 0 0
Non-Covered Loans | Consumer and other
    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 0 0
Recorded Investment With No Allowance 0 0
Recorded Investment With Allowance 0 0
Total Recorded Investment 0 0
Related allowance 0 0
Average Recorded Investment 519,000 0
Past Due and Impaired Loans [Abstract]    
Loans over 90 days past due and still accruing interest $ 0 $ 0