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OTHER BORROWINGS - Schedule of Other Borrowings (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 123,375 $ 127,560
Other borrowings 1,418,336 1,398,709
Fixed Rate Advance due January 10, 2020; fixed interest rate of 1.68%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 50,000
Debt instrument, interest rate, effective percentage 1.68%  
Fixed Rate Advance due January 13, 2020; fixed interest rate of 1.68%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 50,000
Debt instrument, interest rate, effective percentage 1.68%  
Fixed Rate Advance due January 13, 2020; fixed interest rate of 1.67%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 100,000
Debt instrument, interest rate, effective percentage 1.67%  
Fixed Rate Advance due January 15, 2020; fixed interest rate of 1.71%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 50,000
Debt instrument, interest rate, effective percentage 1.71%  
Fixed Rate Advance due January 16, 2020; fixed interest rate of 1.69%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 150,000
Debt instrument, interest rate, effective percentage 1.69%  
Fixed Rate Advance due January 17, 2020; fixed interest rate of 1.70%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 100,000
Debt instrument, interest rate, effective percentage 1.70%  
Fixed Rate Advance due January 21, 2020; fixed interest rate of 1.71%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 50,000
Debt instrument, interest rate, effective percentage 1.71%  
Fixed Rate Advance due January 21, 2020; fixed interest rate of 1.71%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 200,000
Debt instrument, interest rate, effective percentage 1.71%  
Fixed Rate Advance due January 21, 2020; fixed interest rate of 1.70%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 25,000
Debt instrument, interest rate, effective percentage 1.70%  
Fixed Rate Advance due January 21, 2020; fixed interest rate of 1.71%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 75,000
Debt instrument, interest rate, effective percentage 1.71%  
Fixed Rate Advance due January 21, 2020; fixed interest rate of 1.71%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 25,000
Debt instrument, interest rate, effective percentage 1.71%  
Fixed Rate Advance due January 23, 2020; fixed interest rate of 1.71%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 100,000
Debt instrument, interest rate, effective percentage 1.71%  
Fixed Rate Advance due January 27, 2020; fixed interest rate of 1.73%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 50,000
Debt instrument, interest rate, effective percentage 1.73%  
Fixed Rate Advance due February 18, 2020; fixed interest rate of 1.72%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 0 100,000
Debt instrument, interest rate, effective percentage 1.72%  
Fixed Rate Advance due July 6, 2020; fixed interest rate of 0.27%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 150,000 0
Debt instrument, interest rate, effective percentage 0.27%  
Fixed Rate Advance due July 8, 2020; fixed interest rate of 0.27%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.27%  
Fixed Rate Advance due July 10, 2020; fixed interest rate of 0.246%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.246%  
Fixed Rate Advance due July 20, 2020; fixed interest rate of 0.25%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.25%  
Fixed Rate Advance due July 22, 2020; fixed interest rate of 0.27%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.27%  
Fixed Rate Advance due July 23, 2020; fixed interest rate of 0.38%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.38%  
Fixed Rate Advance due July 23, 2020; fixed interest rate of 0.27%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.27%  
Fixed Rate Advance due July 28, 2020; fixed interest rate of 0.25%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.25%  
Fixed Rate Advance due August 18, 2020; fixed interest rate of 0.21%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 150,000 0
Debt instrument, interest rate, effective percentage 0.21%  
Fixed Rate Advance due September 21, 2020; fixed interest rate of 0.22%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 100,000 0
Debt instrument, interest rate, effective percentage 0.22%  
Fixed Rate Advance due March 3, 2025; fixed interest rate of 1.208%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 15,000 0
Debt instrument, interest rate, effective percentage 1.208%  
Fixed Rate Advance due March 2, 2027; fixed interest rate of 1.445%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 15,000 0
Debt instrument, interest rate, effective percentage 1.445%  
Fixed Rate Advance due March 4, 2030; fixed interest rate of 1.606%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 15,000 0
Debt instrument, interest rate, effective percentage 1.606%  
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.55%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 1,417 1,422
Debt instrument, interest rate, effective percentage 4.55%  
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.55%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 981 985
Debt instrument, interest rate, effective percentage 4.55%  
Principal Reducing Advance due September 29, 2031; fixed interest rate of 3.095%    
Other Borrowings [Line Items]    
Advance from correspondent bank $ 1,639 1,712
Debt instrument, interest rate, effective percentage 3.095%  
Subordinated notes payable due March 15, 2027 net of unamortized debt issuance cost of $878 and $943, respectively; fixed interest rate of 5.75% through March 14, 2022; variable interest rate thereafter at three-month LIBOR plus 3.616%    
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 74,122 74,057
Debt instrument, interest rate, effective percentage 5.75%  
Unamortized debt issuance expense $ 878 943
Subordinated notes payable due March 15, 2027 net of unamortized debt issuance cost of $878 and $943, respectively; fixed interest rate of 5.75% through March 14, 2022; variable interest rate thereafter at three-month LIBOR plus 3.616% | London Interbank Offered Rate (LIBOR)    
Other Borrowings [Line Items]    
Basis spread on variable rate 3.616%  
Subordinated notes payable due December 15, 2029 net of unamortized debt issuance cost of $2,287 and $2,408, respectively; fixed interest rate of 4.25% through December 14, 2024; variable interest rate thereafter at three-month SOFR plus 2.94%    
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 117,713 117,592
Debt instrument, interest rate, effective percentage 4.25%  
Unamortized debt issuance expense $ 2,287 2,408
Subordinated notes payable due December 15, 2029 net of unamortized debt issuance cost of $2,287 and $2,408, respectively; fixed interest rate of 4.25% through December 14, 2024; variable interest rate thereafter at three-month SOFR plus 2.94% | Secured Overnight Financing Rate (SOFR)    
Other Borrowings [Line Items]    
Basis spread on variable rate 2.94%  
Subordinated notes payable due May 31, 2030 net of unaccreted purchase accounting fair value adjustment of $1,212 and $1,596, respectively; fixed interest rate of 5.875% through May 31, 2025; variable interest rate thereafter at three-month LIBOR plus 3.63%    
Other Borrowings [Line Items]    
Subordinated deferrable interest debentures $ 76,212 76,595
Debt instrument, interest rate, effective percentage 5.875%  
Unaccreted purchase accounting fair value adjustment $ 1,212 1,596
Subordinated notes payable due May 31, 2030 net of unaccreted purchase accounting fair value adjustment of $1,212 and $1,596, respectively; fixed interest rate of 5.875% through May 31, 2025; variable interest rate thereafter at three-month LIBOR plus 3.63% | London Interbank Offered Rate (LIBOR)    
Other Borrowings [Line Items]    
Basis spread on variable rate 3.63%  
Advance from correspondent bank due September 5, 2026; secured by a loan receivable; fixed interest rate of 2.09%    
Other Borrowings [Line Items]    
Other borrowings $ 1,252 $ 1,346
Debt instrument, interest rate, effective percentage 2.09%