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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Fair Value Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Privately Issued Mortgage-Backed Securities [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance $ 28 $ 44 $ 74
Total gains (losses) realized/unrealized:      
Settlements (6) (16) (30)
Ending Balance 22 28 44
Other Assets and Other Liabilities [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance 8,303 7,325 9,879
Total gains (losses) realized/unrealized:      
Included in earnings 58,740 77,832 110,937
Transfers out of Level 3 (59,331) (76,854) (113,491)
Ending Balance 7,712 8,303 7,325
Changes in unrealized gains included in earnings related to assets still held at end of period $ 7,386 $ 7,978 7,256
Collateralized Debt Obligations [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance     47,393
Total gains (losses) realized/unrealized:      
Included in earnings     30,041
Included in other comprehensive income     (18,268)
Settlements     (870)
Sales     $ (58,296)