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LOAN PORTFOLIO - Impaired loans (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | $ 213,046 | $ 161,617 |  |
Unpaid Principal Balance with no Related Allowance | 289,918 | 207,262 |  |
Average Recorded Investment No Related Allowance | 238,454 | 175,499 |  |
Interest Income with no Related Allowance Accrual Basis | 4,337 | 1,966 |  |
Interest Income with No Related Allowance Cash Basis | 1,627 | 1,389 |  |
Recorded Investment with Related Allowance | 577,262 | 726,288 |  |
Unpaid Principal Balance with Related Allowance | 680,648 | 821,683 |  |
Related Allowance | 51,410 | 64,421 | $ 52,581 | $ 55,205
Average Recorded Investment With Related Allowance | 593,701 | 748,842 |  |
Interest Income with Related Allowance Accrual Basis | 19,906 | 22,129 |  |
Interest Income with Realted Allowance Cash Basis | 1,826 | 3,060 |  |
Recorded Investment | 790,308 | 887,905 | $ 806,509 | $ 945,407
Unpaid Principal Balance | 970,566 | 1,028,945 |  |
Average Recorded Investments | 832,155 | 924,341 |  |
Interest Income on Impaired Loans Accrual Basis | 24,243 | 24,095 |  |
Interest Income on Impaired Loans Cash Basis | 3,453 | 4,449 |  |
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 | 116,818 | 67,996 |  |
Unpaid Principal Balance with no Related Allowance | 154,048 | 82,602 |  |
Average Recorded Investment No Related Allowance | 120,241 | 71,003 |  |
Interest Income with no Related Allowance Accrual Basis | 2,797 | 741 |  |
Interest Income with No Related Allowance Cash Basis | 1,267 | 731 |  |
Recorded Investment with Related Allowance | 316,616 | 374,271 |  |
Unpaid Principal Balance with Related Allowance | 349,284 | 423,648 |  |
Related Allowance | 22,086 | 8,633 |  |
Average Recorded Investment With Related Allowance | 318,606 | 380,273 |  |
Interest Income with Related Allowance Accrual Basis | 14,519 | 17,751 |  |
Interest Income with Realted Allowance Cash Basis | 1,211 | 1,503 |  |
Recorded Investment | 433,434 | 442,267 |  |
Unpaid Principal Balance | 503,332 | 506,250 |  |
Average Recorded Investments | 438,847 | 451,276 |  |
Interest Income on Impaired Loans Accrual Basis | 17,316 | 18,492 |  |
Interest Income on Impaired Loans Cash Basis | 2,478 | 2,234 |  |
Commercial Mortgage Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | 65,100 | 72,620 |  |
Unpaid Principal Balance with no Related Allowance | 100,612 | 91,685 |  |
Average Recorded Investment No Related Allowance | 86,563 | 80,713 |  |
Interest Income with no Related Allowance Accrual Basis | 720 | 940 |  |
Interest Income with No Related Allowance Cash Basis | 277 | 550 |  |
Recorded Investment with Related Allowance | 87,814 | 121,771 |  |
Unpaid Principal Balance with Related Allowance | 124,084 | 133,883 |  |
Related Allowance | 9,783 | 26,172 |  |
Average Recorded Investment With Related Allowance | 93,720 | 122,609 |  |
Interest Income with Related Allowance Accrual Basis | 1,263 | 463 |  |
Interest Income with Realted Allowance Cash Basis | 113 | 173 |  |
Recorded Investment | 152,914 | 194,391 |  |
Unpaid Principal Balance | 224,696 | 225,568 |  |
Average Recorded Investments | 180,283 | 203,322 |  |
Interest Income on Impaired Loans Accrual Basis | 1,983 | 1,403 |  |
Interest Income on Impaired Loans Cash Basis | 390 | 723 |  |
Commercial And Industrial Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | 28,292 | 14,656 |  |
Unpaid Principal Balance with no Related Allowance | 31,254 | 24,642 |  |
Average Recorded Investment No Related Allowance | 28,567 | 17,209 |  |
Interest Income with no Related Allowance Accrual Basis | 659 | 42 |  |
Interest Income with No Related Allowance Cash Basis | 17 | 0 |  |
Recorded Investment with Related Allowance | 90,008 | 138,887 |  |
Unpaid Principal Balance with Related Allowance | 112,005 | 165,399 |  |
Related Allowance | 12,359 | 22,638 |  |
Average Recorded Investment With Related Allowance | 92,666 | 149,153 |  |
Interest Income with Related Allowance Accrual Basis | 788 | 589 |  |
Interest Income with Realted Allowance Cash Basis | 386 | 1,287 |  |
Recorded Investment | 118,300 | 153,543 |  |
Unpaid Principal Balance | 143,259 | 190,041 |  |
Average Recorded Investments | 121,233 | 166,362 |  |
Interest Income on Impaired Loans Accrual Basis | 1,447 | 631 |  |
Interest Income on Impaired Loans Cash Basis | 403 | 1,287 |  |
Construction Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Related Allowance | 2,017 | 1,405 |  |
Recorded Investment | 47,266 | 53,291 |  |
Auto loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | 267 | 599 |  |
Unpaid Principal Balance with no Related Allowance | 267 | 599 |  |
Average Recorded Investment No Related Allowance | 290 | 615 |  |
Interest Income with no Related Allowance Accrual Basis | 3 | 7 |  |
Interest Income with No Related Allowance Cash Basis | 0 | 0 |  |
Recorded Investment with Related Allowance | 22,338 | 24,276 |  |
Unpaid Principal Balance with Related Allowance | 22,338 | 24,276 |  |
Related Allowance | 3,665 | 3,717 |  |
Average Recorded Investment With Related Allowance | 24,328 | 26,562 |  |
Interest Income with Related Allowance Accrual Basis | 1,778 | 1,813 |  |
Interest Income with Realted Allowance Cash Basis | 0 | 0 |  |
Recorded Investment | 22,605 | 24,875 |  |
Unpaid Principal Balance | 22,605 | 24,875 |  |
Average Recorded Investments | 24,618 | 27,177 |  |
Interest Income on Impaired Loans Accrual Basis | 1,781 | 1,820 |  |
Interest Income on Impaired Loans Cash Basis | 0 | 0 |  |
Finance Leases [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | 0 | 94 |  |
Unpaid Principal Balance with no Related Allowance | 0 | 94 |  |
Average Recorded Investment No Related Allowance | 0 | 95 |  |
Interest Income with no Related Allowance Accrual Basis | 0 | 1 |  |
Interest Income with No Related Allowance Cash Basis | 0 | 0 |  |
Recorded Investment with Related Allowance | 2,184 | 2,553 |  |
Unpaid Principal Balance with Related Allowance | 2,184 | 2,553 |  |
Related Allowance | 104 | 71 |  |
Average Recorded Investment With Related Allowance | 2,428 | 2,751 |  |
Interest Income with Related Allowance Accrual Basis | 168 | 202 |  |
Interest Income with Realted Allowance Cash Basis | 0 | 0 |  |
Recorded Investment | 2,184 | 2,647 |  |
Unpaid Principal Balance | 2,184 | 2,647 |  |
Average Recorded Investments | 2,428 | 2,846 |  |
Interest Income on Impaired Loans Accrual Basis | 168 | 203 |  |
Interest Income on Impaired Loans Cash Basis | 0 | 0 |  |
Other Consumer Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | 2,521 | 4,516 |  |
Unpaid Principal Balance with no Related Allowance | 3,688 | 5,876 |  |
Average Recorded Investment No Related Allowance | 2,745 | 4,696 |  |
Interest Income with no Related Allowance Accrual Basis | 158 | 233 |  |
Interest Income with No Related Allowance Cash Basis | 65 | 106 |  |
Recorded Investment with Related Allowance | 11,084 | 12,375 |  |
Unpaid Principal Balance with Related Allowance | 11,830 | 12,734 |  |
Related Allowance | 1,396 | 1,785 |  |
Average Recorded Investment With Related Allowance | 11,579 | 13,322 |  |
Interest Income with Related Allowance Accrual Basis | 1,018 | 1,143 |  |
Interest Income with Realted Allowance Cash Basis | 79 | 48 |  |
Recorded Investment | 13,605 | 16,891 |  |
Unpaid Principal Balance | 15,518 | 18,610 |  |
Average Recorded Investments | 14,324 | 18,018 |  |
Interest Income on Impaired Loans Accrual Basis | 1,176 | 1,376 |  |
Interest Income on Impaired Loans Cash Basis | 144 | 154 |  |
Land Construction [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | 48 | 180 |  |
Unpaid Principal Balance with no Related Allowance | 49 | 233 |  |
Average Recorded Investment No Related Allowance | 48 | 212 |  |
Interest Income with no Related Allowance Accrual Basis | 0 | 2 |  |
Interest Income with No Related Allowance Cash Basis | 1 | 2 |  |
Recorded Investment with Related Allowance | 11,865 | 14,870 |  |
Unpaid Principal Balance with Related Allowance | 19,973 | 19,918 |  |
Related Allowance | 1,402 | 947 |  |
Average Recorded Investment With Related Allowance | 14,126 | 15,589 |  |
Interest Income with Related Allowance Accrual Basis | 372 | 168 |  |
Interest Income with Realted Allowance Cash Basis | 37 | 49 |  |
Recorded Investment | 11,913 | 15,050 |  |
Unpaid Principal Balance | 20,022 | 20,151 |  |
Average Recorded Investments | 14,174 | 15,801 |  |
Interest Income on Impaired Loans Accrual Basis | 372 | 170 |  |
Interest Income on Impaired Loans Cash Basis | 38 | 51 |  |
Residential Construction [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Recorded Investment with no Related Allowance | 0 | 956 |  |
Unpaid Principal Balance with no Related Allowance | 0 | 1,531 |  |
Average Recorded Investment No Related Allowance | 0 | 956 |  |
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 | 252 | 392 |  |
Unpaid Principal Balance with Related Allowance | 355 | 551 |  |
Related Allowance | 55 | 134 |  |
Average Recorded Investment With Related Allowance | 252 | 392 |  |
Interest Income with Related Allowance Accrual Basis | 0 | 0 |  |
Interest Income with Realted Allowance Cash Basis | 0 | 0 |  |
Recorded Investment | 252 | 1,348 |  |
Unpaid Principal Balance | 355 | 2,082 |  |
Average Recorded Investments | 252 | 1,348 |  |
Interest Income on Impaired Loans Accrual Basis | 0 | 0 |  |
Interest Income on Impaired Loans Cash Basis | 0 | 0 |  |
Commercial Construction [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 | 35,101 | 36,893 |  |
Unpaid Principal Balance with Related Allowance | 38,595 | 38,721 |  |
Related Allowance | 560 | 324 |  |
Average Recorded Investment With Related Allowance | 35,996 | 38,191 |  |
Interest Income with Related Allowance Accrual Basis | 0 | 0 |  |
Interest Income with Realted Allowance Cash Basis | 0 | 0 |  |
Recorded Investment | 35,101 | 36,893 |  |
Unpaid Principal Balance | 38,595 | 38,721 |  |
Average Recorded Investments | 35,996 | 38,191 |  |
Interest Income on Impaired Loans Accrual Basis | 0 | 0 |  |
Interest Income on Impaired Loans Cash Basis | $ 0 | $ 0 |  |

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