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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance $ 172,149 $ 170,420 $ 204,959
Gains (Losses) included in earnings (27,563) (8,519) (36,716)
Gains (losses) included in OCI (1) (5) 9
Additions 9,239 10,483 8,037
Sales     (521)
Settlements (740) (230) (1,096)
Transfers out of Level 3 (26)   (4,252)
Ending Balance 153,058 172,149 170,420
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (14,169) 8,725 (18,947)
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance 0 (164,858) (153,158)
Liabilitiy - Gains (Losses) included in earnings   (6,112) 11,700
Gains (losses) included in OCI   0 0
Additions   0 0
Sales     0
Settlements   170,970 0
Transfer out of Level 3     0
Ending Balance   0 (164,858)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss   0 (11,700)
Contingent consideration      
Assets, Fair Value Disclosure [Abstract]      
Transfers out of Level 3     0
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance 0 (164,858) (153,158)
Liabilitiy - Gains (Losses) included in earnings   (6,112) 11,700
Gains (losses) included in OCI   0 0
Additions   0 0
Sales     0
Settlements   170,970 0
Ending Balance   0 (164,858)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss   0 (11,700)
Debt securities available-for-sale | Mortgage Backed Securities      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 1,233 1,288 1,392
Gains (Losses) included in earnings 0 0 0
Gains (losses) included in OCI (1) (5) 9
Additions 0 0 0
Sales     0
Settlements (50) (50) (25)
Transfers out of Level 3 0   (88)
Ending Balance 1,182 1,233 1,288
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 0 0
Trading account debt securities | Mortgage Backed Securities      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 43 43 4,755
Gains (Losses) included in earnings (1) 0 (124)
Gains (losses) included in OCI 0 0 0
Additions 25 0 332
Sales     (156)
Settlements (41) 0 (876)
Transfers out of Level 3 (26)   (3,888)
Ending Balance 0 43 43
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 0 (3)
Trading account debt securities | CMO      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 611 529 1,321
Gains (Losses) included in earnings (1) 2 0
Gains (losses) included in OCI 0 0 0
Additions 71 260 44
Sales     (365)
Settlements (151) (180) (195)
Transfers out of Level 3 0   (276)
Ending Balance 530 611 529
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 1 2 0
Trading account debt securities | Other      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 485 529 602
Gains (Losses) included in earnings (45) (44) (73)
Gains (losses) included in OCI 0 0 0
Additions 0 0 0
Sales     0
Settlements 0 0 0
Transfers out of Level 3 0   0
Ending Balance 440 485 529
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 20 20 42
Mortgage Servicing Rights      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 169,777 168,031 196,889
Gains (Losses) included in earnings (27,516) (8,477) (36,519)
Gains (losses) included in OCI 0 0 0
Additions 9,143 10,223 7,661
Sales     0
Settlements (498) 0 0
Transfers out of Level 3 0   0
Ending Balance 150,906 169,777 168,031
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss $ (14,190) $ 8,703 $ (18,986)