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Fair Value - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Available for sale securities:    
Available for sale securities, at fair value $ 315,255 $ 287,663
Fair Value, Measurements, Recurring [Member]    
Available for sale securities:    
Available for sale securities, at fair value 315,255 287,663
Fair Value, Measurements, Recurring [Member] | Loan Customer Counterparty [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value 14,173 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 14,173 4,829
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value 1,420 305
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value 3  
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 1,483 83
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 315,255 287,663
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Loan Customer Counterparty [Member]    
Derivative financial instruments:    
Derivative financial instruments, assets at fair value 14,173 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 14,173 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 1,420 305
Derivative financial instruments:    
Derivative financial instruments, liabilities at fair value 3  
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 1,483 83
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member]    
Available for sale securities:    
Available for sale securities, at fair value 306 471
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 306 471
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]    
Available for sale securities:    
Available for sale securities, at fair value 266,467 235,773
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 266,467 235,773
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member]    
Available for sale securities:    
Available for sale securities, at fair value 48,482 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 $ 48,482 $ 51,419