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Fair Value of Financial Instruments (Estimated Fair Value and Carrying Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale $ 509,107   $ 446,438      
Investment securities held-to-maturity 371,827          
Federal Home Loan Bank (FHLB) stock 7,496   8,278      
Other investments 10,434   3,962      
Servicing assets 48,227 $ 47,712 47,295 $ 47,242 $ 47,926 $ 50,779
Assets,Carrying Value [Abstract]            
Restricted cash 179   1,375 $ 1,050    
Trading Securities 22   22      
Held-to-maturity Securities, carrying value 375,214   0      
Loans, net of allowance for loan and lease losses 6,229,991   6,457,324      
Accrued interest receivable 56,815   65,547      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 9,244,389   8,415,640      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities 120,555   154,418      
Fair Value, Inputs, Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Cash and cash equivalents 2,755,512   2,154,202      
Restricted cash 179   1,375      
Investment securities available-for-sale 10,875   10,983      
Assets,Carrying Value [Abstract]            
Cash and Cash Equivalents, at Carrying Value 2,755,512   2,154,202      
Restricted cash 179   1,375      
Investment securities AFS , carrying value 10,875   10,983      
Fair Value, Inputs, Level 2 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Trading Securities 22   22      
Investment securities available-for-sale 496,725   435,455      
Investment securities held-to-maturity 371,827   0      
Federal Home Loan Bank (FHLB) stock 7,496   8,278      
Other investments 10,434   3,962      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative Liabilities Current 1,136   1,712      
Assets,Carrying Value [Abstract]            
Trading Securities 22   22      
Investment securities AFS , carrying value 496,725   435,455      
Held-to-maturity Securities, carrying value 375,214   0      
Federal Home Loan Bank Stock at carrying value 7,496   8,278      
Other Investment, Carrying Value 10,434   3,962      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities, carrying value 1,136   1,712      
Fair Value, Inputs, Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 1,507   0      
Total loans (including loans held-for-sale) 6,086,493   6,323,689      
Accrued interest receivable 56,815   65,547      
Servicing assets 48,227   47,295      
Accounts receivable and other assets 84,581   78,845      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits 9,277,633   8,422,599      
Advances from FHLB 64,049   68,147      
Other borrowings 375   707      
Subordinated capital notes 36,405   33,325      
Accrued expenses and other liabilities 120,555   154,418      
Assets,Carrying Value [Abstract]            
Investment securities AFS , carrying value 1,507   0      
Loans, net of allowance for loan and lease losses 6,282,485   6,501,259      
Accrued interest receivable 56,815   65,547      
Servicing assets, carrying value 48,227   47,295      
Account receivable and oher assets, carrying value 84,581   78,845      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 9,244,389   8,415,640      
Advances from FHLB 62,559   65,561      
Other Borrowings 375   707      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities $ 120,555   $ 154,418