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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 2019 using
​ |  | ​ | ​ |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | Quoted Prices in | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
AFS securities: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government and agency securities | ​ | $ | — | ​ | $ | 4,498 | ​ | $ | — | ​ | $ | 4,498
Obligations of states and political subdivisions | ​ |  | — | ​ |  | 442,992 | ​ |  | — | ​ |  | 442,992
Corporate and other bonds(1) | ​ |  | — | ​ |  | 263,070 | ​ |  | — | ​ |  | 263,070
Mortgage-backed securities | ​ |  | — | ​ |  | 1,231,806 | ​ |  | — | ​ |  | 1,231,806
Other securities | ​ |  | — | ​ |  | 3,079 | ​ |  | — | ​ |  | 3,079
Loans held for sale | ​ |  | — | ​ |  | 55,405 | ​ |  | — | ​ |  | 55,405
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ |  | — | ​ |  | 54,345 | ​ |  | — | ​ |  | 54,345
Fair value hedges | ​ |  | — | ​ |  | 182 | ​ |  | — | ​ |  | 182
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ | $ | — | ​ | $ | 54,345 | ​ | $ | — | ​ | $ | 54,345
Cash flow hedges | ​ |  | — | ​ |  | 1,147 | ​ |  | — | ​ |  | 1,147
Fair value hedges | ​ |  | — | ​ |  | 6,256 | ​ |  | — | ​ |  | 6,256
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 2018 using
​ |  | ​ | ​ |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | Quoted Prices in | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
AFS securities: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of states and political subdivisions | ​ | $ | — | ​ | $ | 468,491 | ​ | $ | — | ​ | $ | 468,491
Corporate and other bonds(1) | ​ |  | — | ​ |  | 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
| (1) | Other bonds includes asset-backed securities.
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, 2019 and 2018 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 2019 using
​ |  | ​ | ​ |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | Quoted Prices in | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | — | ​ | $ | — | ​ | $ | 3,593 | ​ | $ | 3,593
Foreclosed properties | ​ |  | — | ​ |  | — | ​ |  | 4,708 | ​ |  | 4,708
Former bank premises | ​ |  | — | ​ |  | — | ​ |  | 3,557 | ​ |  | 3,557
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at December 31, 2018 using
​ |  | ​ | ​ |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | Quoted Prices in | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | 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
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, 2019 and 2018 are as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at December 31, 2019 using
​ |  | ​ | ​ |  | Quoted Prices |  | Significant |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | in Active | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | Total Fair
​ | ​ | ​ | ​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | Value
​ | ​ | Carrying | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Value | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Balance
ASSETS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 436,032 | ​ | $ | 436,032 | ​ | $ | — | ​ | $ | — | ​ | $ | 436,032
AFS securities | ​ |  | 1,945,445 | ​ |  | — | ​ |  | 1,945,445 | ​ |  | — | ​ |  | 1,945,445
HTM securities | ​ |  | 555,144 | ​ |  | — | ​ |  | 585,820 | ​ |  | 17,683 | ​ |  | 603,503
Restricted stock | ​ |  | 130,848 | ​ |  | — | ​ |  | 130,848 | ​ |  | — | ​ |  | 130,848
Loans held for sale | ​ |  | 55,405 | ​ |  | — | ​ |  | 55,405 | ​ |  | — | ​ |  | 55,405
Net loans | ​ |  | 12,568,642 | ​ |  | — | ​ |  | — | ​ |  | 12,449,505 | ​ |  | 12,449,505
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ |  | 54,345 | ​ |  | — | ​ |  | 54,345 | ​ |  | — | ​ |  | 54,345
Fair value hedges | ​ |  | 182 | ​ |  | — | ​ |  | 182 | ​ |  | — | ​ |  | 182
Accrued interest receivable | ​ |  | 52,721 | ​ |  | — | ​ |  | 52,721 | ​ |  | — | ​ |  | 52,721
BOLI | ​ |  | 322,917 | ​ |  | — | ​ |  | 322,917 | ​ |  | — | ​ |  | 322,917
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 13,304,981 | ​ | $ | — | ​ | $ | 13,349,943 | ​ | $ | — | ​ | $ | 13,349,943
Borrowings | ​ |  | 1,513,748 | ​ |  | — | ​ |  | 1,479,606 | ​ |  | — | ​ |  | 1,479,606
Accrued interest payable | ​ |  | 6,108 | ​ |  | — | ​ |  | 6,108 | ​ |  | — | ​ |  | 6,108
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ |  | 54,345 | ​ |  | — | ​ |  | 54,345 | ​ |  | — | ​ |  | 54,345
Cash flow hedges | ​ |  | 1,147 | ​ |  | — | ​ |  | 1,147 | ​ |  | — | ​ |  | 1,147
Fair value hedges | ​ |  | 6,256 | ​ |  | — | ​ |  | 6,256 | ​ |  | — | ​ |  | 6,256
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at December 31, 2018 using
​ | ​ | ​ | ​ | ​ | Quoted Prices | ​ | Significant | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | in Active | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | Total Fair
​ | ​ | ​ | ​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | 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

X
- 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=117815213&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=117815213&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=117815213&loc=d3e19207-110258 + 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=118260190&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=117815213&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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