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Note Fair value measurement (Changes in level 3 assets and liabilities measured at fair value on a recurring basis) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance $ 170,420 $ 204,959 $ 221,811
Gains (Losses) included in earnings (8,519) (36,716) (25,514)
Gains (losses) included in OCI (5) 9 11
Additions 10,483 8,037 12,196
Sales   (521) (2,161)
Settlements (230) (1,096) (1,384)
Transfers out of Level 3   (4,252)  
Ending Balance 172,149 170,420 204,959
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 8,725 (18,947) (4,788)
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance (164,858) (153,158) (120,380)
Liabilitiy - Gains (Losses) included in earnings (6,112) (11,700) (32,778)
Gains (losses) included in OCI 0 0 0
Additions 0 0 0
Sales   0 0
Settlements 170,970 0 0
Transfer out of Level 3   0  
Ending Balance 0 (164,858) (153,158)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss 0 (11,700) (32,778)
Contingent consideration      
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance (164,858) (153,158) (120,380)
Liabilitiy - Gains (Losses) included in earnings (6,112) (11,700) (32,778)
Gains (losses) included in OCI 0 0 0
Additions 0 0 0
Sales   0 0
Settlements 170,970 0 0
Transfer out of Level 3   0  
Ending Balance 0 (164,858) (153,158)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss 0 [1] (11,700) (32,778)
Debt securities available-for-sale | Mortgage Backed Securities      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 1,288 1,392 1,434
Gains (Losses) included in earnings 0 0 (3)
Gains (losses) included in OCI (5) 9 11
Additions 0 0 0
Sales   0 0
Settlements (50) (25) (50)
Transfers out of Level 3   (88)  
Ending Balance 1,233 1,288 1,392
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 4,755 6,454
Gains (Losses) included in earnings 0 (124) (86)
Gains (losses) included in OCI 0 0 0
Additions 0 332 1,128
Sales   (156) (1,852)
Settlements 0 (876) (889)
Transfers out of Level 3   (3,888)  
Ending Balance 43 43 4,755
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 (3) (84)
Trading account debt securities | CMO      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 529 1,321 1,831
Gains (Losses) included in earnings 2 0 (4)
Gains (losses) included in OCI 0 0 0
Additions 260 44 233
Sales   (365) (309)
Settlements (180) (195) (430)
Transfers out of Level 3   (276)  
Ending Balance 611 529 1,321
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 2 0 2
Trading account debt securities | Other      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 529 602 687
Gains (Losses) included in earnings (44) (73) (85)
Gains (losses) included in OCI 0 0 0
Additions 0 0 0
Sales   0 0
Settlements 0 0 0
Transfers out of Level 3   0  
Ending Balance 485 529 602
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 20 42 39
Mortgage Servicing Rights      
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 168,031 196,889 211,405
Gains (Losses) included in earnings (8,477) (36,519) (25,336)
Gains (losses) included in OCI 0 0 0
Additions 10,223 7,661 10,835
Sales   0 0
Settlements 0 0 (15)
Transfers out of Level 3   0  
Ending Balance 169,777 168,031 196,889
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss $ 8,703 $ (18,986) $ (4,745)
[1]
Effective May 22, 2018, the Corporation entered into a Termination Agreement with the FDIC to terminate the Corporation’s loss share arrangement ahead of their contractual maturities. Refer to Note 10 for additional information.