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LOAN PORTFOLIO - Impaired loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance $ 161,617 $ 192,165    
Unpaid Principal Balance with no Related Allowance 207,262 217,897    
Average Recorded Investment No Related Allowance 175,499 196,175    
Interest Income with no Related Allowance Accrual Basis 1,966 2,072    
Interest Income with No Related Allowance Cash Basis 1,389 2,328    
Recorded Investment with Related Allowance 726,288 614,344    
Unpaid Principal Balance with Related Allowance 821,683 699,270    
Related Allowance 64,421 52,581 $ 55,205 $ 102,601
Average Recorded Investment With Related Allowance 748,842 629,855    
Interest Income with Related Allowance Accrual Basis 22,129 23,528    
Interest Income with Realted Allowance Cash Basis 3,060 4,175    
Recorded Investment 887,905 806,509 $ 945,407 $ 919,112
Unpaid Principal Balance 1,028,945 917,167    
Average Recorded Investments 924,341 826,030    
Interest Income on Impaired Loans Accrual Basis 24,095 25,600    
Interest Income on Impaired Loans Cash Basis 4,449 6,503    
FHA/VA Guaranteed loans [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 0 0    
Unpaid Principal Balance with no Related Allowance 0 0    
Average Recorded Investment No Related Allowance 0 0    
Interest Income with no Related Allowance Accrual Basis 0 0    
Interest Income with No Related Allowance Cash Basis 0 0    
Recorded Investment with Related Allowance 0 0    
Unpaid Principal Balance with Related Allowance 0 0    
Related Allowance 0 0    
Average Recorded Investment With Related Allowance 0 0    
Interest Income with Related Allowance Accrual Basis 0 0    
Interest Income with Realted Allowance Cash Basis 0 0    
Recorded Investment 0 0    
Unpaid Principal Balance 0 0    
Average Recorded Investments 0 0    
Interest Income on Impaired Loans Accrual Basis 0 0    
Interest Income on Impaired Loans Cash Basis 0 0    
Other residential loans [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 67,996 65,495    
Unpaid Principal Balance with no Related Allowance 82,602 74,146    
Average Recorded Investment No Related Allowance 71,003 67,282    
Interest Income with no Related Allowance Accrual Basis 741 558    
Interest Income with No Related Allowance Cash Basis 731 688    
Recorded Investment with Related Allowance 374,271 395,173    
Unpaid Principal Balance with Related Allowance 423,648 440,947    
Related Allowance 8,633 21,787    
Average Recorded Investment With Related Allowance 380,273 398,790    
Interest Income with Related Allowance Accrual Basis 17,751 17,543    
Interest Income with Realted Allowance Cash Basis 1,503 1,640    
Recorded Investment 442,267 460,668    
Unpaid Principal Balance 506,250 515,093    
Average Recorded Investments 451,276 466,072    
Interest Income on Impaired Loans Accrual Basis 18,492 18,101    
Interest Income on Impaired Loans Cash Basis 2,234 2,328    
Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 72,620 54,048    
Unpaid Principal Balance with no Related Allowance 91,685 66,448    
Average Recorded Investment No Related Allowance 80,713 54,967    
Interest Income with no Related Allowance Accrual Basis 940 1,329    
Interest Income with No Related Allowance Cash Basis 550 832    
Recorded Investment with Related Allowance 121,771 27,479    
Unpaid Principal Balance with Related Allowance 133,883 40,634    
Related Allowance 26,172 3,073    
Average Recorded Investment With Related Allowance 122,609 30,518    
Interest Income with Related Allowance Accrual Basis 463 347    
Interest Income with Realted Allowance Cash Basis 173 501    
Recorded Investment 194,391 81,527    
Unpaid Principal Balance 225,568 107,082    
Average Recorded Investments 203,322 85,485    
Interest Income on Impaired Loans Accrual Basis 1,403 1,676    
Interest Income on Impaired Loans Cash Basis 723 1,333    
Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 14,656 27,492    
Unpaid Principal Balance with no Related Allowance 24,642 29,957    
Average Recorded Investment No Related Allowance 17,209 28,326    
Interest Income with no Related Allowance Accrual Basis 42 0    
Interest Income with No Related Allowance Cash Basis 0 693    
Recorded Investment with Related Allowance 138,887 143,214    
Unpaid Principal Balance with Related Allowance 165,399 164,050    
Related Allowance 22,638 18,096    
Average Recorded Investment With Related Allowance 149,153 148,547    
Interest Income with Related Allowance Accrual Basis 589 2,338    
Interest Income with Realted Allowance Cash Basis 1,287 1,939    
Recorded Investment 153,543 170,706    
Unpaid Principal Balance 190,041 194,007    
Average Recorded Investments 166,362 176,873    
Interest Income on Impaired Loans Accrual Basis 631 2,338    
Interest Income on Impaired Loans Cash Basis 1,287 2,632    
Construction Loans [Member]        
Financing Receivable Impaired [Line Items]        
Related Allowance 1,405 1,202    
Recorded Investment 53,291 53,516    
Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 599 0    
Unpaid Principal Balance with no Related Allowance 599 0    
Average Recorded Investment No Related Allowance 615 0    
Interest Income with no Related Allowance Accrual Basis 7 0    
Interest Income with No Related Allowance Cash Basis 0 0    
Recorded Investment with Related Allowance 24,276 21,581    
Unpaid Principal Balance with Related Allowance 24,276 21,581    
Related Allowance 3,717 6,653    
Average Recorded Investment With Related Allowance 26,562 23,531    
Interest Income with Related Allowance Accrual Basis 1,813 1,494    
Interest Income with Realted Allowance Cash Basis 0 0    
Recorded Investment 24,875 21,581    
Unpaid Principal Balance 24,875 21,581    
Average Recorded Investments 27,177 23,531    
Interest Income on Impaired Loans Accrual Basis 1,820 1,494    
Interest Income on Impaired Loans Cash Basis 0 0    
Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 94 0    
Unpaid Principal Balance with no Related Allowance 94 0    
Average Recorded Investment No Related Allowance 95 0    
Interest Income with no Related Allowance Accrual Basis 1 0    
Interest Income with No Related Allowance Cash Basis 0 0    
Recorded Investment with Related Allowance 2,553 2,077    
Unpaid Principal Balance with Related Allowance 2,553 2,077    
Related Allowance 71 86    
Average Recorded Investment With Related Allowance 2,751 2,484    
Interest Income with Related Allowance Accrual Basis 202 170    
Interest Income with Realted Allowance Cash Basis 0 0    
Recorded Investment 2,647 2,077    
Unpaid Principal Balance 2,647 2,077    
Average Recorded Investments 2,846 2,484    
Interest Income on Impaired Loans Accrual Basis 203 170    
Interest Income on Impaired Loans Cash Basis 0 0    
Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 4,516 2,618    
Unpaid Principal Balance with no Related Allowance 5,876 4,300    
Average Recorded Investment No Related Allowance 4,696 2,766    
Interest Income with no Related Allowance Accrual Basis 233 21    
Interest Income with No Related Allowance Cash Basis 106 115    
Recorded Investment with Related Allowance 12,375 13,816    
Unpaid Principal Balance with Related Allowance 12,734 14,043    
Related Allowance 1,785 1,684    
Average Recorded Investment With Related Allowance 13,322 14,782    
Interest Income with Related Allowance Accrual Basis 1,143 1,592    
Interest Income with Realted Allowance Cash Basis 48 25    
Recorded Investment 16,891 16,434    
Unpaid Principal Balance 18,610 18,343    
Average Recorded Investments 18,018 17,548    
Interest Income on Impaired Loans Accrual Basis 1,376 1,613    
Interest Income on Impaired Loans Cash Basis 154 140    
Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 180 0    
Unpaid Principal Balance with no Related Allowance 233 0    
Average Recorded Investment No Related Allowance 212 0    
Interest Income with no Related Allowance Accrual Basis 2 0    
Interest Income with No Related Allowance Cash Basis 2 0    
Recorded Investment with Related Allowance 14,870 9,578    
Unpaid Principal Balance with Related Allowance 19,918 13,758    
Related Allowance 947 1,060    
Average Recorded Investment With Related Allowance 15,589 9,727    
Interest Income with Related Allowance Accrual Basis 168 44    
Interest Income with Realted Allowance Cash Basis 49 70    
Recorded Investment 15,050 9,578    
Unpaid Principal Balance 20,151 13,758    
Average Recorded Investments 15,801 9,727    
Interest Income on Impaired Loans Accrual Basis 170 44    
Interest Income on Impaired Loans Cash Basis 51 70    
Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 956 3,046    
Unpaid Principal Balance with no Related Allowance 1,531 3,046    
Average Recorded Investment No Related Allowance 956 3,098    
Interest Income with no Related Allowance Accrual Basis 0 164    
Interest Income with No Related Allowance Cash Basis 0 0    
Recorded Investment with Related Allowance 392 1,426    
Unpaid Principal Balance with Related Allowance 551 2,180    
Related Allowance 134 142    
Average Recorded Investment With Related Allowance 392 1,476    
Interest Income with Related Allowance Accrual Basis 0 0    
Interest Income with Realted Allowance Cash Basis 0 0    
Recorded Investment 1,348 4,472    
Unpaid Principal Balance 2,082 5,226    
Average Recorded Investments 1,348 4,574    
Interest Income on Impaired Loans Accrual Basis 0 164    
Interest Income on Impaired Loans Cash Basis 0 0    
Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Recorded Investment with no Related Allowance 0 39,466    
Unpaid Principal Balance with no Related Allowance 0 40,000    
Average Recorded Investment No Related Allowance 0 39,736    
Interest Income with no Related Allowance Accrual Basis 0 0    
Interest Income with No Related Allowance Cash Basis 0 0    
Recorded Investment with Related Allowance 36,893 0    
Unpaid Principal Balance with Related Allowance 38,721 0    
Related Allowance 324 0    
Average Recorded Investment With Related Allowance 38,191 0    
Interest Income with Related Allowance Accrual Basis 0 0    
Interest Income with Realted Allowance Cash Basis 0 0    
Recorded Investment 36,893 39,466    
Unpaid Principal Balance 38,721 40,000    
Average Recorded Investments 38,191 39,736    
Interest Income on Impaired Loans Accrual Basis 0 0    
Interest Income on Impaired Loans Cash Basis $ 0 $ 0