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Adoption of Accounting Standards (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Decrease in opening retained earnings $ (504,931,000) $ (357,221,000) $ (504,931,000) $ (357,221,000) $ (363,140,000) $ (361,638,000) $ (364,285,000) $ (352,777,000) $ (351,864,000) $ (350,693,000)
Amount of allowance for credit loss on accrued interest on financing receivable 0   0              
Amount, after allowance for credit loss, of accrued interest 13,600,000   13,600,000              
Provision for credit losses 28,176,000 675,000 30,056,000 1,475,000            
Unfunded Commitments                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Provision for credit losses 241,000   308,000              
Retained Earnings                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Decrease in opening retained earnings (159,134,000) $ (165,590,000) (159,134,000) $ (165,590,000) $ (169,494,000) $ (167,864,000) (171,613,000) $ (158,316,000) $ (153,198,000) $ (149,966,000)
Cumulative effect adjustment due to the adoption of ASC 326, net of tax                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Decrease in opening retained earnings             7,818,000      
Cumulative effect adjustment due to the adoption of ASC 326, net of tax | Retained Earnings                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Decrease in opening retained earnings             $ 7,818,000      
Other                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Available for sale debt securities and has included such accrued interest $ 2,000,000   $ 2,000,000