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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financial assets:            
Available-for-sale securities, at fair value $ 543,282   $ 582,183      
Interest receivable 11,218   7,241      
Mortgage servicing rights, net 63,046 $ 48,464 33,081 $ 46,291 $ 40,382 $ 29,711
Carrying Amount            
Financial assets:            
Cash and cash equivalents 97,165   136,327      
Available-for-sale securities, at fair value 543,282   582,183      
Federal Home Loan Bank Stock 11,152   7,743      
Loans, net 3,091,080   1,827,037      
Loans held for sale 466,369   507,442      
Interest receivable 11,218   7,241      
Mortgage servicing rights, net 63,046   32,070      
Derivatives assets 10,316   19,745      
Financial liabilities:            
Deposits, Without stated maturities 3,051,322   2,280,531      
Deposits, With stated maturities 667,216   391,031      
Securities sold under agreement to repurchase 14,556   21,561      
Short term borrowings 52,766   150,000      
Interest payable 1,262   620      
Long-term debt 143,533   44,892      
Derivatives liabilities 2,434   586      
Fair Value            
Financial assets:            
Cash and cash equivalents 97,165   136,327      
Available-for-sale securities, at fair value 543,282   582,183      
Federal Home Loan Bank Stock 11,152   7,743      
Loans, net 3,077,928   1,823,335      
Loans held for sale 466,369   507,442      
Interest receivable 11,218   7,241      
Mortgage servicing rights, net 63,046   33,081      
Derivatives assets 10,316   19,745      
Financial liabilities:            
Deposits, Without stated maturities 3,051,322   2,280,531      
Deposits, With stated maturities 662,988   390,484      
Securities sold under agreement to repurchase 14,556   21,561      
Short term borrowings 52,766   150,000      
Interest payable 1,262   620      
Long-term debt 148,136   47,377      
Derivatives liabilities 2,434   586      
Fair Value | Fair Value Level 1            
Financial assets:            
Cash and cash equivalents 97,165   136,327      
Financial liabilities:            
Deposits, Without stated maturities 3,051,322   2,280,531      
Securities sold under agreement to repurchase 14,556   21,561      
Short term borrowings 52,766   150,000      
Interest payable 367   237      
Fair Value | Fair Value Level 2            
Financial assets:            
Available-for-sale securities, at fair value 539,678   577,634      
Loans, net 2,999,008   1,822,054      
Loans held for sale 466,369   507,442      
Interest receivable 11,218   7,241      
Derivatives assets 10,316   19,745      
Financial liabilities:            
Deposits, With stated maturities 662,988   390,484      
Interest payable 895   383      
Long-term debt 148,136   47,377      
Derivatives liabilities 2,434   586      
Fair Value | Fair Value Level 3            
Financial assets:            
Available-for-sale securities, at fair value 3,604   4,549      
Federal Home Loan Bank Stock 11,152   7,743      
Loans, net 78,920   1,281      
Mortgage servicing rights, net $ 63,046   $ 33,081