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Note Borrowings (Repurchase agreements accounted for as secured borrowings) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 281,529 $ 390,921
Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 281,529 $ 390,921
Repurchase liability weighted average interest rate 2.43% 1.66%
US Treasury Securities | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 237,621 $ 279,373
Repurchase liability weighted average interest rate 2.54% 1.75%
US Treasury Securities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 138,689 $ 148,516
Repurchase liability weighted average interest rate 2.56% 1.70%
US Treasury Securities | After 30 to 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 79,374 $ 87,357
Repurchase liability weighted average interest rate 2.47% 1.70%
US Treasury Securities | After 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 19,558 $ 43,500
Repurchase liability weighted average interest rate 2.72% 2.00%
Obligations of U.S. Government sponsored entities | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 6,055 $ 66,056
Repurchase liability weighted average interest rate 2.45% 1.64%
Obligations of U.S. Government sponsored entities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 0 $ 30,656
Repurchase liability weighted average interest rate 0.00% 1.77%
Obligations of U.S. Government sponsored entities | After 30 to 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 6,055 $ 19,463
Repurchase liability weighted average interest rate 2.45% 1.48%
Obligations of U.S. Government sponsored entities | After 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 0 $ 15,937
Repurchase liability weighted average interest rate 0.00% 1.60%
Mortgage Backed Securities | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 27,324 $ 31,383
Repurchase liability weighted average interest rate 2.35% 1.51%
Mortgage Backed Securities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 6,859 $ 31,383
Repurchase liability weighted average interest rate 1.15% 1.51%
Mortgage Backed Securities | After 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 20,465 $ 0
Repurchase liability weighted average interest rate 2.75% 0.00%
CMO | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 10,529 $ 14,109
Repurchase liability weighted average interest rate 0.25% 0.28%
CMO | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase    
Repurchase liability $ 10,529 $ 14,109
Repurchase liability weighted average interest rate 0.25% 0.28%