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Note Derivative instruments and hedging activities (Cash flow hedges and non-hedging derivatives outstanding) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Notional Amount Of Derivatives    
Derivative, Notional Amount $ 399,572 $ 493,931
Derivative Asset Fair Value Net    
Deivatives assets 13,603 16,719
Derivative Liability Fair Value Net    
Derivatives liabilities 12,320 14,431
Designated As Hedging Instrument Member    
Notional Amount Of Derivatives    
Derivative, Notional Amount 89,590 98,850
Derivative Asset Fair Value Net    
Deivatives assets 12 76
Derivative Liability Fair Value Net    
Derivatives liabilities 734 132
Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 309,982 395,081
Derivative Asset Fair Value Net    
Deivatives assets 13,591 16,643
Derivative Liability Fair Value Net    
Derivatives liabilities 11,586 14,299
Forward contracts | Designated As Hedging Instrument Member    
Notional Amount Of Derivatives    
Derivative, Notional Amount 89,590 98,850
Forward contracts | Designated As Hedging Instrument Member | Other assets    
Derivative Asset Fair Value Net    
Deivatives assets 12 76
Forward contracts | Designated As Hedging Instrument Member | Other liabilities    
Derivative Liability Fair Value Net    
Derivatives liabilities 734 132
Forward contracts | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 0 70,850
Forward contracts | Non designated as hedging instrument | Trading account debt securities    
Derivative Asset Fair Value Net    
Deivatives assets 0 180
Forward contracts | Non designated as hedging instrument | Other liabilities    
Derivative Liability Fair Value Net    
Derivatives liabilities 0 19
Interest rate swap | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 0 2,252
Interest rate swap | Non designated as hedging instrument | Other assets    
Derivative Asset Fair Value Net    
Deivatives assets 0 10
Interest rate swap | Non designated as hedging instrument | Other liabilities    
Derivative Liability Fair Value Net    
Derivatives liabilities 0 10
Interest rate cap | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 177,826 185,596
Interest rate cap | Non designated as hedging instrument | Other assets    
Derivative Asset Fair Value Net    
Deivatives assets 125 97
Interest rate cap | Non designated as hedging instrument | Other liabilities    
Derivative Liability Fair Value Net    
Derivatives liabilities 119 87
Indexed options on deposits | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 69,254 70,306
Indexed options on deposits | Non designated as hedging instrument | Other assets    
Derivative Asset Fair Value Net    
Deivatives assets 13,466 16,356
Bifurcated embedded options | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 62,902 66,077
Bifurcated embedded options | Non designated as hedging instrument | Interest-bearing deposits    
Derivative Liability Fair Value Net    
Derivatives liabilities $ 11,467 $ 14,183