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Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses Broken out by Portfolio Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance $ 244,723 $ 192,644 $ 217,613 $ 165,359
Charge-offs (24,616) (29,118) (71,466) (39,339)
Recoveries 2,084 662 8,158 5,289
Provision for loan losses 18,950 33,403 88,624 66,368
Foreign Currency Translation Adjustments (576) (84) (2,364) (170)
Ending Balance 240,565 197,507 240,565 197,507
Commercial Portfolio Segment | Software and internet        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 104,229 106,728 103,045 80,981
Charge-offs (16,526) (24,815) (56,742) (26,980)
Recoveries 305 195 4,525 1,239
Provision for loan losses 8,591 5,965 46,438 32,834
Foreign Currency Translation Adjustments (261) (7) (928) (8)
Ending Balance 96,338 88,066 96,338 88,066
Commercial Portfolio Segment | Hardware        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 23,871 20,472 23,085 25,860
Charge-offs (3,058) 0 (6,559) (4,049)
Recoveries 1,080 240 1,502 3,049
Provision for loan losses 11,048 (70) 15,010 (4,291)
Foreign Currency Translation Adjustments (336) 0 (433) 73
Ending Balance 32,605 20,642 32,605 20,642
Commercial Portfolio Segment | Private equity/venture capital        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 49,807 29,276 35,282 27,997
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for loan losses 2,203 3,170 17,008 4,551
Foreign Currency Translation Adjustments (67) (4) (347) (106)
Ending Balance 51,943 32,442 51,943 32,442
Commercial Portfolio Segment | Life science/healthcare        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 41,852 17,233 36,576 15,208
Charge-offs (28) (117) (3,029) (3,336)
Recoveries 361 50 1,037 129
Provision for loan losses (5,298) 19,815 3,252 24,976
Foreign Currency Translation Adjustments 161 (22) (788) (18)
Ending Balance 37,048 36,959 37,048 36,959
Commercial Portfolio Segment | Premium wine        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 4,810 4,409 5,205 4,473
Charge-offs 0 0 0 0
Recoveries 0 0 0 7
Provision for loan losses 288 253 (138) 182
Foreign Currency Translation Adjustments (9) 0 22 0
Ending Balance 5,089 4,662 5,089 4,662
Commercial Portfolio Segment | Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 9,480 5,894 4,252 3,253
Charge-offs (5,004) (4,186) (5,034) (4,974)
Recoveries 207 173 880 729
Provision for loan losses 142 2,941 4,573 5,874
Foreign Currency Translation Adjustments (4) (49) 150 (109)
Ending Balance 4,821 4,773 4,821 4,773
Commercial Portfolio Segment | Commercial loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 234,049 184,012 207,445 157,772
Charge-offs (24,616) (29,118) (71,364) (39,339)
Recoveries 1,953 658 7,944 5,153
Provision for loan losses 16,974 32,074 86,143 64,126
Foreign Currency Translation Adjustments (516) (82) (2,324) (168)
Ending Balance 227,844 187,544 227,844 187,544
Consumer Portfolio Segment | Consumer loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 10,674 8,632 10,168 7,587
Charge-offs 0 0 (102) 0
Recoveries 131 4 214 136
Provision for loan losses 1,976 1,329 2,481 2,242
Foreign Currency Translation Adjustments (60) (2) (40) (2)
Ending Balance $ 12,721 $ 9,963 $ 12,721 $ 9,963