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Derivative Financial Instruments (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
derivative
Mar. 31, 2021
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
derivative
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Interest Expense $ 13,627,000   $ 35,247,000 $ 29,341,000 $ 82,824,000  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 73,000          
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Interest Expense     $ 139,000 139,000 $ 139,000  
Not Designated as Hedging Instrument | Interest rate swaps | Correspondent Banks | Other liabilities            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 418,767,000     $ 418,767,000   $ 503,929,000
Weighted average remaining term (years)   6 years 9 months 18 days   6 years    
Received/Pay variable rate (weighted average) 2.21%     2.21%   2.26%
Pay/Received fixed rate (weighted average) 4.06%     4.06%   3.86%
Estimated fair value $ (21,358,000)     $ (21,358,000)   $ (34,606,000)
Not Designated as Hedging Instrument | Interest rate swaps | Correspondent Banks | Other assets            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 93,433,000     $ 93,433,000   $ 0
Weighted average remaining term (years)   0 years   8 years 9 months 18 days    
Received/Pay variable rate (weighted average) 2.08%     2.08%   0.00%
Pay/Received fixed rate (weighted average) 2.86%     2.86%   0.00%
Estimated fair value $ 1,763,000     $ 1,763,000   $ 0
Not Designated as Hedging Instrument | Interest rate swaps | Customers | Other liabilities            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 93,433,000     $ 93,433,000   $ 0
Weighted average remaining term (years)   0 years   8 years 9 months 18 days    
Received/Pay variable rate (weighted average) 2.08%     2.08%   0.00%
Pay/Received fixed rate (weighted average) 2.86%     2.86%   0.00%
Estimated fair value $ (1,763,000)     $ (1,763,000)   $ 0
Not Designated as Hedging Instrument | Interest rate swaps | Customers | Other assets            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 418,767,000     $ 418,767,000   $ 503,929,000
Weighted average remaining term (years)   6 years 9 months 18 days   6 years    
Received/Pay variable rate (weighted average) 2.21%     2.21%   2.26%
Pay/Received fixed rate (weighted average) 4.06%     4.06%   3.86%
Estimated fair value $ 21,358,000     $ 21,358,000   $ 34,606,000
Not Designated as Hedging Instrument | Risk participation agreement            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount 111,400,000     111,400,000   112,800,000
Credit valuation adjustment 64,000     64,000   398,000
Designated as Hedging Instrument | Interest rate swaps | Other liabilities            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 0     $ 0   $ 100,000,000
Weighted average remaining term (years)   4 years 3 months 18 days   0 years    
Received/Pay variable rate (weighted average) 0.00%     0.00%   0.22%
Pay/Received fixed rate (weighted average) 0.00%     0.00%   0.49%
Estimated fair value $ 0     $ 0   $ (602,000)
Designated as Hedging Instrument | Interest rate swaps | Other assets            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 100,000,000     $ 100,000,000   $ 0
Weighted average remaining term (years)   0 years   4 years    
Received/Pay variable rate (weighted average) 0.19%     0.19%   0.00%
Pay/Received fixed rate (weighted average) 0.49%     0.49%   0.00%
Estimated fair value $ 921,000     $ 921,000   $ 0
Designated as Hedging Instrument | Cash Flow Hedge | Interest rate swaps            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 100,000,000.0     $ 100,000,000.0   $ 100,000,000.0
Number of derivative instruments held | derivative 1     1   1