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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables present the balances of financial assets and liabilities measured at fair value on a recurring basis at December 31, 2018 and 2017 (dollars in thousands):
| Fair Value Measurements at December 31, 2018 using
| Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Balance
ASSETS |  |  |  |  |  |  |  |  |  |  |
AFS securities: |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | — |  |  | $ | 468,491 |  |  | $ | — |  |  | $ | 468,491 |
Corporate bonds | — |  |  | 167,696 |  |  | — |  |  | 167,696 |
Mortgage-backed securities | — |  |  | 1,129,865 |  |  | — |  |  | 1,129,865 |
Other securities | — |  |  | 8,769 |  |  | — |  |  | 8,769 |
Derivatives: |  |  |  |  |  |  |  |  |  |
Interest rate swap | — |  |  | 19,426 |  |  | — |  |  | 19,426 |
Fair value hedges | — |  |  | 1,872 |  |  | — |  |  | 1,872 |
LIABILITIES |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |
Interest rate swap | $ | — |  |  | $ | 19,426 |  |  | $ | — |  |  | $ | 19,426 |
Cash flow hedges | — |  |  | 4,786 |  |  | — |  |  | 4,786 |
Fair value hedges | — |  |  | 1,684 |  |  | — |  |  | 1,684 |
| Fair Value Measurements at December 31, 2017 using
| Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Balance
ASSETS |  |  |  |  |  |  |  |  |  |  |
AFS securities: |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | — |  |  | $ | 301,824 |  |  | $ | — |  |  | $ | 301,824 |
Corporate bonds | — |  |  | 113,880 |  |  | — |  |  | 113,880 |
Mortgage-backed securities | — |  |  | 548,858 |  |  | — |  |  | 548,858 |
Other securities | — |  |  | 9,660 |  |  | — |  |  | 9,660 |
Loans held for sale | — |  |  | 40,662 |  |  | — |  |  | 40,662 |
Derivatives: |  |  |  |  |  |  |  |  |  |
Interest rate swap | — |  |  | 1,350 |  |  | — |  |  | 1,350 |
Cash flow hedges | — |  |  | 49 |  |  | — |  |  | 49 |
Fair value hedges | — |  |  | 1,598 |  |  | — |  |  | 1,598 |
Interest rate lock commitments | — |  |  | — |  |  | 559 |  |  | 559 |
Best efforts forward delivery commitments | — |  |  | — |  |  | 12 |  |  | 12 |
LIABILITIES |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |
Interest rate swap | $ | — |  |  | $ | 1,350 |  |  | $ | — |  |  | $ | 1,350 |
Cash flow hedges | — |  |  | 8,005 |  |  | — |  |  | 8,005 |
Fair value hedges | — |  |  | 76 |  |  | — |  |  | 76 |
Schedule of Financial Assets Measured at Fair Value on Nonrecurring Basis | The following tables summarize the Company’s financial assets that were measured at fair value on a nonrecurring basis at December 31, 2018 and 2017 (dollars in thousands):
| Fair Value Measurements at December 31, 2018 using
| Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Balance
ASSETS |  |  |  |  |  |  |  |  |  |  |
Impaired loans | $ | — |  |  | $ | — |  |  | $ | 3,734 |  |  | $ | 3,734 |
Foreclosed properties | — |  |  | — |  |  | 6,722 |  |  | 6,722 |
Former bank premises | — |  |  | — |  |  | 2,090 |  |  | 2,090 |
| Fair Value Measurements at December 31, 2017 using
| Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Balance
ASSETS |  |  |  |  |  |  |  |  |  |  |
Impaired loans | $ | — |  |  | $ | — |  |  | $ | 3,229 |  |  | $ | 3,229 |
Foreclosed properties | — |  |  | — |  |  | 5,253 |  |  | 5,253 |
Former bank premises | — |  |  | — |  |  | 1,383 |  |  | 1,383 |
Carrying Values and Estimated Fair Values of the Company's Financial Instruments | The carrying values and estimated fair values of the Company’s financial instruments as of December 31, 2018 and 2017 are as follows (dollars in thousands):
|  |  | Fair Value Measurements at December 31, 2018 using
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  | Total Fair Value
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Balance
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 261,199 |  |  | $ | 261,199 |  |  | $ | — |  |  | $ | — |  |  | $ | 261,199 |
AFS securities | 1,774,821 |  |  | — |  |  | 1,774,821 |  |  | — |  |  | 1,774,821 |
HTM securities | 492,272 |  |  | — |  |  | 499,501 |  |  | — |  |  | 499,501 |
Restricted stock | 124,602 |  |  | — |  |  | 124,602 |  |  | — |  |  | 124,602 |
Net loans | 9,675,162 |  |  | — |  |  | — |  |  | 9,534,717 |  |  | 9,534,717 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap | 19,426 |  |  | — |  |  | 19,426 |  |  | — |  |  | 19,426 |
Fair value hedges | 1,872 |  |  | — |  |  | 1,872 |  |  | — |  |  | 1,872 |
Accrued interest receivable | 46,062 |  |  | — |  |  | 46,062 |  |  | — |  |  | 46,062 |
BOLI | 263,034 |  |  | — |  |  | 263,034 |  |  | — |  |  | 263,034 |
LIABILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits | $ | 9,970,960 |  |  | $ | — |  |  | $ | 9,989,788 |  |  | $ | — |  |  | $ | 9,989,788 |
Borrowings | 1,756,278 |  |  | — |  |  | 1,742,038 |  |  | — |  |  | 1,742,038 |
Accrued interest payable | 5,284 |  |  | — |  |  | 5,284 |  |  | — |  |  | 5,284 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap | 19,426 |  |  | — |  |  | 19,426 |  |  | — |  |  | 19,426 |
Cash flow hedges | 4,786 |  |  | — |  |  | 4,786 |  |  | — |  |  | 4,786 |
Fair value hedges | 1,684 |  |  | — |  |  | 1,684 |  |  | — |  |  | 1,684 |
|  |  | Fair Value Measurements at December 31, 2017 using
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  | Total Fair Value
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Balance
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 199,373 |  |  | $ | 199,373 |  |  | $ | — |  |  | $ | — |  |  | $ | 199,373 |
AFS securities | 974,222 |  |  | — |  |  | 974,222 |  |  | — |  |  | 974,222 |
HTM securities | 199,639 |  |  | — |  |  | 203,483 |  |  | — |  |  | 203,483 |
Restricted stock | 75,283 |  |  | — |  |  | 75,283 |  |  | — |  |  | 75,283 |
Loans held for sale | 40,662 |  |  | — |  |  | 40,662 |  |  | — |  |  | 40,662 |
Net loans | 7,103,344 |  |  | — |  |  | — |  |  | 7,117,593 |  |  | 7,117,593 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap | 1,350 |  |  | — |  |  | 1,350 |  |  | — |  |  | 1,350 |
Cash flow hedges | 49 |  |  | — |  |  | 49 |  |  | — |  |  | 49 |
Fair value hedges | 1,598 |  |  | — |  |  | 1,598 |  |  | — |  |  | 1,598 |
Interest rate lock commitments | 559 |  |  | — |  |  | — |  |  | 559 |  |  | 559 |
Best efforts forward delivery commitments | 12 |  |  | — |  |  | — |  |  | 12 |  |  | 12 |
Accrued interest receivable | 26,427 |  |  | — |  |  | 26,427 |  |  | — |  |  | 26,427 |
BOLI | 182,854 |  |  | — |  |  | 182,854 |  |  | — |  |  | 182,854 |
LIABILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits | $ | 6,991,718 |  |  | $ | — |  |  | $ | 6,977,845 |  |  | $ | — |  |  | $ | 6,977,845 |
Borrowings | 1,219,414 |  |  | — |  |  | 1,198,645 |  |  | — |  |  | 1,198,645 |
Accrued interest payable | 2,538 |  |  | — |  |  | 2,538 |  |  | — |  |  | 2,538 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap | 1,350 |  |  | — |  |  | 1,350 |  |  | — |  |  | 1,350 |
Cash flow hedges | 8,005 |  |  | — |  |  | 8,005 |  |  | — |  |  | 8,005 |
Fair value hedges | 76 |  |  | — |  |  | 76 |  |  | — |  |  | 76 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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