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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Regulatory capital positions (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Securitization of FHA/VA mortgage loan production into GNMA mortgage-backed securities | $ 235,100 |
To originate loans [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instruments whose contract amounts represent credit risk | 77,649 | $ 41,271
Unused personal lines of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instruments whose contract amounts represent credit risk | 710,607 | 667,552
Commercial lines of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instruments whose contract amounts represent credit risk | 471,732 | 421,437
Commercial Letters Of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instruments whose contract amounts represent credit risk | 46,728 | 47,515
Standby letters of credit [Member] [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instruments whose contract amounts represent credit risk | 2,691 | 2,556
Commitments To Sell Loans [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instruments whose contract amounts represent credit risk | 37,909 | 119,679
First Ban Corp [Member] |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital | 1,989,873 | 1,921,329
Common Equity Tier 1 Capital To Risk Weight Assets | 1,674,164 | 1,597,117
Tier 1 Capital | 1,675,282 | 1,597,117
Tier 1 Leverage Capital | 1,675,282 | 1,597,117
Total Capital Required For Capital Adequacy | 706,432 | 720,329
Common Equity Tier 1 Capital To Risk Weight Assets Capital Adequacy | 397,368 | 405,185
Tier 1 Risk Based Capital Required for Capital Adequacy | 529,824 | 540,247
Tier 1 Leverage Capital Required for Capital Adequacy | $ 477,643 | $ 466,376
Total Risk Based Capital Ratio | 22.53% | 21.34%
Common Equity Tier 1 Capital To Risk Weight Assets Ratio | 18.96% | 17.74%
Tier 1 Risk Based Capital Ratio | 18.97% | 17.74%
Tier 1 Leverage Ratio | 14.03% | 13.70%
Total Risk Based Capital Ratio Adequately Capitalized | 8.00% | 8.00%
Common Equity Tier 1 Capital To Risk Weight Assets Ratio Capital Adequacy | 4.50% | 4.50%
Tier 1 Risk Based Capital Ratio Adequately Capitalized | 6.00% | 6.00%
Tier 1 Leverage Ratio Adequately Capitalized | 4.00% | 4.00%
FirstBank [Member] |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total Capital | $ 1,947,627 | $ 1,872,120
Common Equity Tier 1 Capital To Risk Weight Assets | 1,562,431 | 1,523,332
Tier 1 Capital | 1,835,445 | 1,757,642
Tier 1 Leverage Capital | 1,835,445 | 1,757,642
Total Capital Required For Capital Adequacy | 706,218 | 720,091
Common Equity Tier 1 Capital To Risk Weight Assets Capital Adequacy | 397,248 | 405,051
Tier 1 Risk Based Capital Required for Capital Adequacy | 529,663 | 540,068
Tier 1 Leverage Capital Required for Capital Adequacy | 477,056 | 465,740
Total Capital Required to be Well Capitalized | 882,772 | 900,114
Common Equity Tier 1 Capital To Risk Weight Assets Well Capitalized | 573,802 | 585,074
Tier 1 Risk Based Capital Required to be Well Capitalized | 706,218 | 720,091
Tier 1 Leverage Capital Required to be Well Capitalized | $ 596,320 | $ 582,174
Total Risk Based Capital Ratio | 22.06% | 20.80%
Common Equity Tier 1 Capital To Risk Weight Assets Ratio | 17.70% | 16.92%
Tier 1 Risk Based Capital Ratio | 20.79% | 19.53%
Tier 1 Leverage Ratio | 15.39% | 15.10%
Total Risk Based Capital Ratio Adequately Capitalized | 8.00% | 8.00%
Common Equity Tier 1 Capital To Risk Weight Assets Ratio Capital Adequacy | 4.50% | 4.50%
Tier 1 Risk Based Capital Ratio Adequately Capitalized | 6.00% | 6.00%
Tier 1 Leverage Ratio Adequately Capitalized | 4.00% | 4.00%
Total Risk Based Capital Ratio Well Capitalized | 10.00% | 10.00%
Common Equity Tier1 Capital To Risk Weight Assets Ratio Well Capitalized | 6.50% | 6.50%
Tier 1 Risk Based Capital to Risk Weighted Well Capitalized | 8.00% | 8.00%
Tier 1 Leverage Ratio Well Capitalized | 5.00% | 5.00%

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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