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Fair value measurement - Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance $ 130,596 $ 122,874 $ 120,068
Gains (Losses) included in earnings (11,631) 95 (10,318)
Gains (losses) included in OCI (5) (15) (13)
Additions 3,601 7,830 13,419
Sales (1,269)    
Settlements 207 (188) (282)
Ending Balance 121,499 130,596 122,874
Changes in unrealized gains (losses) included in earnings relating to assets still held (512) 11,943 6,364
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance 0 (9,241) 0
Gains (Losses) included in earnings 0 9,241 0
Gains (losses) included in OCI 0 0 0
Additions 0 0 (9,241)
Sales 0    
Settlements 0 0 0
Ending Balance 0 0 (9,241)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss 0 0 0
Contingent consideration      
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance 0 (9,241) 0
Gains (Losses) included in earnings 0 9,241 0
Gains (losses) included in OCI 0 0 0
Additions 0 0 (9,241)
Sales 0    
Settlements 0 0 0
Ending Balance 0 0 (9,241)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss 0 0 0
Debt securities available-for-sale | Mortgage Backed Securities      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 711 826 1,014
Gains (Losses) included in earnings 0 0 0
Gains (losses) included in OCI (5) (15) (13)
Additions 0 0 0
Sales 0    
Settlements (100) (100) (175)
Ending Balance 606 711 826
Changes in unrealized gains (losses) included in earnings relating to assets still held 0 0 0
Debt securities available-for-sale | Other      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 1,000 0  
Gains (Losses) included in earnings 0 0  
Gains (losses) included in OCI 0 0  
Additions 1,500 1,000  
Sales 0    
Settlements 0 0  
Ending Balance 2,500 1,000 0
Changes in unrealized gains (losses) included in earnings relating to assets still held 0 0  
Trading account debt securities | CMO      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 113 198 278
Gains (Losses) included in earnings 0 (2) (1)
Gains (losses) included in OCI 0 0 0
Additions 4 5 29
Sales 0    
Settlements (112) (88) (107)
Ending Balance 5 113 198
Changes in unrealized gains (losses) included in earnings relating to assets still held 0 (2) (1)
Trading account debt securities | Mortgage Backed Securities      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 215 0  
Gains (Losses) included in earnings (2) (4)  
Gains (losses) included in OCI 0 0  
Additions 0 211  
Sales 0    
Settlements (101) 0  
Ending Balance 112 215 0
Changes in unrealized gains (losses) included in earnings relating to assets still held (1) 4  
Trading account debt securities | Other      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 207 280 381
Gains (Losses) included in earnings (40) (73) (101)
Gains (losses) included in OCI 0 0 0
Additions 0 0 0
Sales 0    
Settlements 0 0 0
Ending Balance 167 207 280
Changes in unrealized gains (losses) included in earnings relating to assets still held 18 (23) (45)
Mortgage Servicing Rights      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 128,350 121,570 118,395
Gains (Losses) included in earnings (11,589) 166 (10,216)
Gains (losses) included in OCI 0 0 0
Additions 2,097 6,614 13,391
Sales (1,269)    
Settlements 520 0 0
Ending Balance 118,109 128,350 121,570
Changes in unrealized gains (losses) included in earnings relating to assets still held $ (529) $ 11,964 $ 6,410