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Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Financial assets:          
Interest receivable $ 14,943   $ 13,069    
Mortgage servicing rights, net 79,890 $ 109,449 76,107 $ 48,464 $ 33,081
Carrying Amount          
Financial assets:          
Cash and cash equivalents 181,630   119,751    
Investment securities 609,568   543,992    
Federal Home Loan Bank Stock 13,432   11,412    
Loans, net 3,510,923   3,142,870    
Loans held for sale 323,486   526,185    
Interest receivable 14,943   13,069    
Mortgage servicing rights, net 79,890   76,107    
Derivatives assets 13,662   9,690    
Financial liabilities:          
Deposits, Without stated maturities 3,076,790   2,976,066    
Deposits, With stated maturities 1,052,683   688,329    
Securities sold under agreement to repurchase and federal funds sold 50,117   14,293    
Federal Home Loan Bank advances 129,921   302,372    
Subordinated debt 30,930   30,930    
Interest payable 3,616   1,504    
Derivatives liabilities 4,076   1,699    
Fair Value          
Financial assets:          
Cash and cash equivalents 181,630   119,751    
Investment securities 609,568   543,992    
Loans, net 3,508,972   3,141,400    
Loans held for sale 323,486   526,185    
Interest receivable 14,943   13,069    
Mortgage servicing rights, net 79,890   76,107    
Derivatives assets 13,662   9,690    
Financial liabilities:          
Deposits, Without stated maturities 3,076,790   2,976,066    
Deposits, With stated maturities 1,052,825   682,403    
Securities sold under agreement to repurchase and federal funds sold 50,117   14,293    
Federal Home Loan Bank advances 130,023   302,465    
Subordinated debt 30,000   36,670    
Interest payable 3,616   1,504    
Derivatives liabilities 4,076   1,699    
Fair Value | Fair Value Level 1          
Financial assets:          
Cash and cash equivalents 181,630   119,751    
Financial liabilities:          
Deposits, Without stated maturities 3,076,790   2,976,066    
Securities sold under agreement to repurchase and federal funds sold 50,117   14,293    
Interest payable 990   575    
Fair Value | Fair Value Level 2          
Financial assets:          
Investment securities 609,568   540,388    
Loans, net     3,064,373    
Loans held for sale 323,486   526,185    
Interest receivable 14,943   13,069    
Derivatives assets 13,662   9,690    
Financial liabilities:          
Deposits, With stated maturities 1,052,825   682,403    
Federal Home Loan Bank advances 130,023   302,465    
Subordinated debt 30,000   36,670    
Interest payable 2,626   929    
Derivatives liabilities 4,076   1,699    
Fair Value | Fair Value Level 3          
Financial assets:          
Investment securities     3,604    
Loans, net 3,508,972   77,027    
Mortgage servicing rights, net $ 79,890   $ 76,107