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FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents the balances of financial assets and liabilities measured at fair value on a recurring basis at June 30, 2020 and December 31, 2019 (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements at June 30, 2020 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 | ​ | $ | — | ​ | $ | 14,646 | ​ | $ | — | ​ | $ | 14,646
Obligations of states and political subdivisions | ​ |  | — | ​ |  | 539,527 | ​ |  | — | ​ |  | 539,527
Corporate and other bonds(1) | ​ |  | — | ​ |  | 131,350 | ​ |  | — | ​ |  | 131,350
Mortgage-backed securities | ​ |  | — | ​ |  | 1,330,542 | ​ |  | — | ​ |  | 1,330,542
Other securities | ​ |  | — | ​ |  | 3,099 | ​ |  | — | ​ |  | 3,099
Loans held for sale | ​ |  | — | ​ |  | 55,067 | ​ |  | — | ​ |  | 55,067
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ |  | — | ​ |  | 194,707 | ​ |  | — | ​ |  | 194,707
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ | $ | — | ​ | $ | 194,707 | ​ | $ | — | ​ | $ | 194,707
Fair value hedges | ​ |  | — | ​ |  | 14,530 | ​ |  | — | ​ |  | 14,530
(1) | Other bonds include asset-backed securities.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​ | $ | — | ​ | $ | 21,320 | ​ | $ | — | ​ | $ | 21,320
Obligations of states and political subdivisions | ​ | ​ | — | ​ | ​ | 447,091 | ​ | ​ | — | ​ | ​ | 447,091
Corporate and other bonds(1) | ​ |  | — | ​ |  | 135,959 | ​ |  | — | ​ |  | 135,959
Mortgage-backed securities | ​ |  | — | ​ |  | 1,337,996 | ​ |  | — | ​ |  | 1,337,996
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
(1) | Other bonds include asset-backed securities.
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 at June 30, 2020 and December 31, 2019 are as follows (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at June 30, 2020 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 | ​ | $ | 842,020 | ​ | $ | 842,020 | ​ | $ | — | ​ | $ | — | ​ | $ | 842,020
AFS securities | ​ |  | 2,019,164 | ​ |  | — | ​ |  | 2,019,164 | ​ |  | — | ​ |  | 2,019,164
HTM securities | ​ |  | 547,561 | ​ |  | — | ​ |  | 600,146 | ​ |  | 13,283 | ​ |  | 613,429
Restricted stock | ​ |  | 105,832 | ​ |  | — | ​ |  | 105,832 | ​ |  | — | ​ |  | 105,832
Loans held for sale | ​ |  | 55,067 | ​ |  | — | ​ |  | 55,067 | ​ |  | — | ​ |  | 55,067
Net loans | ​ |  | 14,138,669 | ​ |  | — | ​ |  | — | ​ |  | 13,970,248 | ​ |  | 13,970,248
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ |  | 194,707 | ​ |  | — | ​ |  | 194,707 | ​ |  | — | ​ |  | 194,707
Accrued interest receivable | ​ |  | 62,330 | ​ |  | — | ​ |  | 62,330 | ​ |  | — | ​ |  | 62,330
BOLI | ​ |  | 327,075 | ​ |  | — | ​ |  | 327,075 | ​ |  | — | ​ |  | 327,075
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 15,605,139 | ​ | $ | — | ​ | $ | 15,653,360 | ​ | $ | — | ​ | $ | 15,653,360
Borrowings | ​ |  | 1,125,030 | ​ |  | — | ​ |  | 1,093,558 | ​ |  | — | ​ |  | 1,093,558
Accrued interest payable | ​ |  | 4,495 | ​ |  | — | ​ |  | 4,495 | ​ |  | — | ​ |  | 4,495
Derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest rate swap | ​ |  | 194,707 | ​ |  | — | ​ |  | 194,707 | ​ |  | — | ​ |  | 194,707
Fair value hedges | ​ |  | 14,530 | ​ |  | — | ​ |  | 14,530 | ​ |  | — | ​ |  | 14,530
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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

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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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