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Borrowings Schedule of Other Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Aug. 31, 2016
Dec. 31, 2015
Short Term Borrowings and Long Term Debt [Line Items]      
Long-term borrowings, Weighted Average Rate (as a percent) 1.78%   1.59%
Total long-term borrowings $ 676,612   $ 242,391
Long-term debt, gross $ 5,000    
FHLB advances: 0.45% - 0.81% fixed-rate notes | Minimum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 0.45%    
FHLB advances: 0.45% - 0.81% fixed-rate notes | Maximum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 0.81%    
Federal Home Loan Bank Advances [Member] | FHLB advances: 0.59% - 7.44% fixed-rate notes due 2016 to 2027 (2)      
Short Term Borrowings and Long Term Debt [Line Items]      
Long-term borrowings, Amount $ 494,013   $ 181,394
Long-term borrowings, Weighted Average Rate (as a percent) 1.45%   1.41%
Advances payable from Federal Home Loan Banks $ 492,800   $ 181,000
Purchase accounting premiums $ 1,200   400
Federal Home Loan Bank Advances [Member] | FHLB advances: 0.59% - 7.44% fixed-rate notes due 2016 to 2027 (2) | Minimum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 0.59%    
Federal Home Loan Bank Advances [Member] | FHLB advances: 0.59% - 7.44% fixed-rate notes due 2016 to 2027 (2) | Maximum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 7.44%    
Securities sold under agreements to repurchase | Securities sold under agreements to repurchase: 1.48% - 4.30% fixed-rate notes due 2016 to 2017 (3)      
Short Term Borrowings and Long Term Debt [Line Items]      
Long-term borrowings, Amount $ 42,394   $ 17,453
Long-term borrowings, Weighted Average Rate (as a percent) 3.61%   0.27%
Purchase accounting premiums $ 400   $ 500
Debt carrying amount after mater netting $ 42,000   17,000
Securities sold under agreements to repurchase | Securities sold under agreements to repurchase: 1.48% - 4.30% fixed-rate notes due 2016 to 2017 (3) | Minimum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 1.48%    
Securities sold under agreements to repurchase | Securities sold under agreements to repurchase: 1.48% - 4.30% fixed-rate notes due 2016 to 2017 (3) | Maximum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 4.30%    
Line of Credit [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Long-term borrowings, Amount $ 124,698 $ 125,000 $ 25,000
Long-term borrowings, Weighted Average Rate (as a percent) 2.27%   2.27%
Stated interest rate 1.75%    
Subordinated Debt Obligations [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Long-term borrowings, Amount $ 0   $ 18,544
Long-term borrowings, Weighted Average Rate (as a percent) 0.00%   3.99%
Subordinated Debt Obligations [Member] | Subordinated debt obligations: floating-rate based on three-month LIBOR plus 1.45% - 2.85% due 2034 to 2035 (4)      
Short Term Borrowings and Long Term Debt [Line Items]      
Long-term borrowings, Amount $ 11,260   $ 0
Long-term borrowings, Weighted Average Rate (as a percent) 3.09%   0.00%
Purchase accounting discounts $ 3,700    
Long-term debt, gross $ 15,000    
Subordinated Debt Obligations [Member] | Subordinated debt obligations: floating-rate based on three-month LIBOR plus 1.45% - 2.85% due 2034 to 2035 (4) | Minimum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 1.45%    
Subordinated Debt Obligations [Member] | Subordinated debt obligations: floating-rate based on three-month LIBOR plus 1.45% - 2.85% due 2034 to 2035 (4) | Maximum [Member]      
Short Term Borrowings and Long Term Debt [Line Items]      
Stated interest rate 2.85%    
Subordinated Debt Obligations [Member] | Subordinated debt obligations: floating-rate based on three-month LIBOR plus 3.25% due in 2032 (5)      
Short Term Borrowings and Long Term Debt [Line Items]      
Long-term borrowings, Amount $ 4,247   $ 0
Long-term borrowings, Weighted Average Rate (as a percent) 4.09%   0.00%
Stated interest rate 3.25%    
Purchase accounting discounts $ 800    
Federal Home Loan Bank Advances [Member] | FHLB advances: 0.45% - 0.81% fixed-rate notes      
Short Term Borrowings and Long Term Debt [Line Items]      
Short-term borrowings, Amount $ 400,000   $ 100,000
Short-term borrowings, Weighted Average Rate (as a percent) 0.52%   0.34%