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Fair Value - Fair Value Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Available for sale securities:    
Available for sale securities, at fair value $ 651,514 $ 287,663
Fair Value, Measurements, Recurring [Member]    
Available for sale securities:    
Available for sale securities, at fair value 651,514 287,663
Fair Value, Measurements, Recurring [Member] | Loan Customer Counterparty [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value 11,912 4,829
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value   240
Fair Value, Measurements, Recurring [Member] | Financial Institution Counterparty [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value   240
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value 11,912 4,829
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value   305
Fair Value, Measurements, Recurring [Member] | Forward Mortgage-Backed Securities Trades [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value   3
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value   83
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 651,514 287,663
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Loan Customer Counterparty [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value 11,912 4,829
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value   240
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Institution Counterparty [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value   240
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value 11,912 4,829
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Lock Commitments [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value   305
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Forward Mortgage-Backed Securities Trades [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value   3
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value   83
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]    
Available for sale securities:    
Available for sale securities, at fair value 612,334 235,773
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 612,334 235,773
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member]    
Available for sale securities:    
Available for sale securities, at fair value 39,180 51,419
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value $ 39,180 51,419
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member]    
Available for sale securities:    
Available for sale securities, at fair value   471
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value   $ 471