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Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Activity in Allowance for Loan Losses Broken out by Portfolio Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance $ 286,709 $ 236,496 $ 255,024 $ 225,366
Charge-offs (22,205) (12,338) (48,220) (51,449)
Recoveries 2,164 1,828 5,878 6,155
Provision for (Reduction of) Loan Losses 19,436 22,409 74,088 67,273
Foreign Currency Translation Adjustments (391) 615 (1,057) 1,665
Ending Balance 285,713 249,010 285,713 249,010
Allowance for Unfunded Credit Commitments [Roll Forward]        
Allowance for unfunded credit commitments, beginning balance 54,104 47,000 51,770 45,265
Provision for unfunded credit commitments (2,262) 1,113 138 2,789
Foreign currency translation adjustments (34) 59 (100) 118
Ending balance 51,808 48,172 51,808 48,172
Commercial loans | Software/internet        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 102,648 92,937 96,104 97,388
Charge-offs (6,304) (8,791) (26,377) (36,172)
Recoveries 841 426 1,818 2,833
Provision for (Reduction of) Loan Losses 16,640 7,241 42,620 27,487
Foreign Currency Translation Adjustments (335) 199 (675) 476
Ending Balance 113,490 92,012 113,490 92,012
Commercial loans | Hardware        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 34,695 27,800 27,614 31,166
Charge-offs (12,697) (2,453) (16,111) (6,726)
Recoveries 227 115 1,458 459
Provision for (Reduction of) Loan Losses (1,763) 5,681 7,788 6,075
Foreign Currency Translation Adjustments 36 156 (251) 325
Ending Balance 20,498 31,299 20,498 31,299
Commercial loans | Private equity/venture capital        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 89,409 66,785 82,468 50,299
Charge-offs 0 0 (112) 0
Recoveries 3 0 13 0
Provision for (Reduction of) Loan Losses 1,632 10,142 8,200 26,111
Foreign Currency Translation Adjustments (33) 279 442 796
Ending Balance 91,011 77,206 91,011 77,206
Commercial loans | Life science/healthcare        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 35,064 27,730 24,924 25,446
Charge-offs (2,076) (1,083) (2,940) (7,493)
Recoveries 189 63 245 107
Provision for (Reduction of) Loan Losses 2,322 (1,621) 13,829 6,906
Foreign Currency Translation Adjustments (47) (45) (606) 78
Ending Balance 35,452 25,044 35,452 25,044
Commercial loans | Premium wine        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 3,438 3,133 3,532 4,115
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Reduction of) Loan Losses 125 362 42 (567)
Foreign Currency Translation Adjustments (3) 10 (14) (43)
Ending Balance 3,560 3,505 3,560 3,505
Commercial loans | Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 2,896 4,135 3,941 4,768
Charge-offs (1,128) 0 (2,391) (1,047)
Recoveries 771 947 1,874 1,424
Provision for (Reduction of) Loan Losses 118 (931) (775) (1,005)
Foreign Currency Translation Adjustments (2) (26) 6 (15)
Ending Balance 2,655 4,125 2,655 4,125
Commercial loans | Commercial loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 268,150 222,520 238,583 213,182
Charge-offs (22,205) (12,327) (47,931) (51,438)
Recoveries 2,031 1,551 5,408 4,823
Provision for (Reduction of) Loan Losses 19,074 20,874 71,704 65,007
Foreign Currency Translation Adjustments (384) 573 (1,098) 1,617
Ending Balance 266,666 233,191 266,666 233,191
Consumer loans | Consumer loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 18,559 13,976 16,441 12,184
Charge-offs 0 (11) (289) (11)
Recoveries 133 277 470 1,332
Provision for (Reduction of) Loan Losses 362 1,535 2,384 2,266
Foreign Currency Translation Adjustments (7) 42 41 48
Ending Balance $ 19,047 $ 15,819 $ 19,047 $ 15,819