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OTHER BORROWINGS - Narrative (Details) - USD ($)
Mar. 15, 2022
Mar. 15, 2022
Sep. 30, 2017
Mar. 13, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Other borrowings     $ 808,572,000   $ 492,321,000
Federal home loan bank, advances, general debt obligations, amount of available, unused funds     347,400,000    
Line of credit facility, remaining borrowing capacity     30,000,000    
Credit arrangements for federal funds purchase     82,000,000    
Pledged assets separately reported, loans pledged for federal reserve bank, at fair value     1,040,000,000    
Loans pledged at federal reserve discount window available for borrowing     $ 678,100,000    
Senior Subordinated Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount       $ 75,000,000.0  
Debt instrument, interest rate, stated percentage       5.75%  
Senior Subordinated Notes | Scenario, Forecast          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage 100.00% 100.00%      
Senior Subordinated Notes | London Interbank Offered Rate (LIBOR) | Scenario, Forecast          
Debt Instrument [Line Items]          
Basis spread on variable rate 3.616%