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FHLB Advances, Other Borrowings and Subordinated Notes (Narrative) (Details)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended 77 Months Ended
Sep. 13, 2022
Sep. 12, 2022
Dec. 31, 2014
CAD ($)
Sep. 30, 2022
USD ($)
building
Rate
Dec. 31, 2019
USD ($)
Dec. 31, 2014
USD ($)
May 31, 2020
CAD ($)
Dec. 31, 2021
USD ($)
Oct. 06, 2021
Sep. 30, 2021
USD ($)
Mar. 31, 2020
USD ($)
Sep. 18, 2018
USD ($)
Debt Instrument [Line Items]                        
Outstanding borrowings       $ 64,268,000       $ 80,319,000   $ 85,668,000    
Secured borrowings       311,958,000       341,327,000   341,038,000    
Other borrowings       61,777,000       63,292,000   63,770,000    
Subordinated notes       437,260,000       436,938,000   436,811,000    
Collateral Pledged                        
Debt Instrument [Line Items]                        
Pledged financial instruments       $ 18,100,000                
Line of Credit | Secured Overnight Financing Rate (SOFR)                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 1.55% 1.45%                    
Line of Credit | Base Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 0.70% 0.60%                    
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Commitment fee | Rate       0.30%                
Securities sold under repurchase agreements | Overnight Sweep Collateral                        
Debt Instrument [Line Items]                        
Securities sold under agreements to repurchase       $ 9,212,000       9,200,000   14,100,000    
Pledged financial instruments       18,094,000                
Secured Debt                        
Debt Instrument [Line Items]                        
Secured borrowings       $ 8,400,000                
Fixed Rate Promissory Note                        
Debt Instrument [Line Items]                        
Trust  Preferred Securities                     $ 66,400,000  
Fixed interest rate                 1.70%      
Number of properties securing debt | building       3                
Other borrowings       $ 61,800,000       63,300,000   63,800,000    
Term Facility                        
Debt Instrument [Line Items]                        
Outstanding borrowings                       $ 150,000,000
Term Facility | Base Rate | Base Rate Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       0.75%                
Term Facility | London Interbank Offered Rate (LIBOR) | Eurodollar Rate Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       1.25%                
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Outstanding borrowings                       $ 100,000,000
Amount outstanding       $ 0                
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Base Rate Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       1.10%                
Revolving Credit Facility | Base Rate | Base Rate Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       0.70%                
Revolving Credit Facility | Federal Funds Rate | Base Rate Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       0.50%                
Revolving Credit Facility | Eurodollar rate | Base Rate Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       1.00%                
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Eurodollar Rate Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       1.55%                
Receivables Purchase Agreement | Secured Debt                        
Debt Instrument [Line Items]                        
Proceeds from debt issuance     $ 150       $ 420          
Secured borrowings       $ 303,500,000       $ 332,200,000   $ 331,000,000    
Receivables Purchase Agreement | Secured Debt | Canadian Commercial Paper Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       0.78%                
Subordinated debt maturing June 2029                        
Debt Instrument [Line Items]                        
Proceeds from common stock offering, net         $ 296,700,000              
Subordinated debt maturing June 2029 | Subordinated Debt                        
Debt Instrument [Line Items]                        
Trust  Preferred Securities         $ 300,000,000              
Fixed interest rate         4.85%              
Subordinated debt maturing June 2024 | Subordinated Debt                        
Debt Instrument [Line Items]                        
Proceeds from debt issuance           $ 139,100,000            
Trust  Preferred Securities           $ 140,000,000            
Fixed interest rate           5.00%