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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2020
Fair Value Measurements |
Schedule of financial assets and financial liabilities measured at fair value on a recurring basis | ​ The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Level 1 |  | Level 2 |  | Level 3 |  | Total
March 31, 2020 | Inputs |  | Inputs |  | Inputs |  | Fair Value
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | $ | — | ​ | $ | 45,394 | ​ | $ | — | ​ | $ | 45,394
Obligations of U.S. government corporations and agencies |  | — | ​ |  | 90,574 | ​ |  | — | ​ |  | 90,574
Obligations of states and political subdivisions |  | — | ​ |  | 284,747 | ​ |  | — | ​ |  | 284,747
Commercial mortgage-backed securities | ​ | — | ​ | ​ | 245,421 | ​ | ​ | — | ​ | ​ | 245,421
Residential mortgage-backed securities |  | — | ​ |  | 1,000,857 | ​ |  | — | ​ |  | 1,000,857
Corporate debt securities |  | — | ​ |  | 98,952 | ​ |  | — | ​ |  | 98,952
Equity securities | ​ | — | ​ |  | 4,936 | ​ |  | — | ​ |  | 4,936
Loans held for sale | ​ | — | ​ | ​ | 89,943 | ​ | ​ | — | ​ | ​ | 89,943
Derivative assets | ​ | — | ​ | ​ | 40,978 | ​ | ​ | — | ​ | ​ | 40,978
Derivative liabilities | ​ | — | ​ | ​ | 46,600 | ​ | ​ | — | ​ | ​ | 46,600
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2019 | Inputs |  | Inputs |  | Inputs |  | Fair Value
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | $ | — | ​ | $ | 51,737 | ​ | $ | — | ​ | $ | 51,737
Obligations of U.S. government corporations and agencies |  | — | ​ |  | 163,000 | ​ |  | — | ​ |  | 163,000
Obligations of states and political subdivisions |  | — | ​ |  | 268,291 | ​ |  | — | ​ |  | 268,291
Commercial mortgage-backed securities | ​ | — | ​ | ​ | 139,287 | ​ | ​ | — | ​ | ​ | 139,287
Residential mortgage-backed securities |  | — | ​ |  | 921,966 | ​ |  | — | ​ |  | 921,966
Corporate debt securities |  | — | ​ |  | 103,976 | ​ |  | — | ​ |  | 103,976
Equity securities | ​ | — | ​ |  | 5,952 | ​ |  | — | ​ | ​ | 5,952
Loans held for sale | ​ | — | ​ | ​ | 68,699 | ​ | ​ | — | ​ | ​ | 68,699
Derivative assets | ​ | — | ​ | ​ | 13,400 | ​ | ​ | — | ​ | ​ | 13,400
Derivative liabilities | ​ | — | ​ | ​ | 14,821 | ​ | ​ | — | ​ | ​ | 14,821
Schedule of assets and liabilities measured at fair value on a non-recurring basis | The following table summarizes assets and liabilities measured at fair value on a non-recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
​ |  | Inputs |  | Inputs |  | Inputs |  | Fair Value
March 31, 2020 | ​ | ​
Loans evaluated individually | ​ | $ | — | ​ | $ | — | ​ | $ | 1,413 | ​ | $ | 1,413
OREO | ​ |  | — | ​ |  | — | ​ |  | 55 | ​ |  | 55
Bank property held for sale | ​ |  | — | ​ |  | — | ​ |  | 3,413 | ​ |  | 3,413
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Loans evaluated individually | ​ | $ | — | ​ | $ | — | ​ | $ | 2,686 | ​ | $ | 2,686
OREO | ​ |  | — | ​ |  | — | ​ |  | 55 | ​ |  | 55
Bank property held for sale | ​ | ​ | — | ​ |  | — | ​ |  | 4,004 | ​ |  | 4,004
Schedule of quantitative information about Level 3 fair value measurements | The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis for which the Company has utilized level 3 inputs to determine fair value (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Quantitative Information about Level 3 Fair Value Measurements
​ | Fair Value | ​ | Valuation | ​ | Unobservable | ​ | Range
​ | Estimate |  | Techniques |  | Input |  | (Weighted Average)
March 31, 2020 | ​
Loans evaluated individually | $ | 1,413 |  | Appraisal of collateral |  | Appraisal adjustments |  | -0.3% to -100% (-69.6)%
OREO |  | 55 |  | Appraisal of collateral |  | Appraisal adjustments |  | -25.0% to -100% (-65.0)%
Bank property held for sale | ​ | 3,413 | ​ | Appraisal of collateral or real estate listing price | ​ | Appraisal adjustments | ​ | -6.2% to -64.9% (-27.3)%
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loans evaluated individually | $ | 2,686 |  | Appraisal of collateral |  | Appraisal adjustments |  | -2.9% to -100% (-57.8)%
OREO |  | 55 |  | Appraisal of collateral |  | Appraisal adjustments |  | -25.0% to -100% (-65.0)%
Bank property held for sale | ​ | 4,004 | ​ | Appraisal of collateral or real estate listing price | ​ | Appraisal adjustments | ​ | -6.2% to -71.3% (-40.7)%
Schedule of estimated fair values of financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Quantitative Information about Level 3 Fair Value Measurements
​ | Fair Value | ​ | Valuation | ​ | Unobservable | ​ | Range
​ | Estimate |  | Techniques |  | Input |  | (Weighted Average)
March 31, 2020 | ​
Loans evaluated individually | $ | 1,413 |  | Appraisal of collateral |  | Appraisal adjustments |  | -0.3% to -100% (-69.6)%
OREO |  | 55 |  | Appraisal of collateral |  | Appraisal adjustments |  | -25.0% to -100% (-65.0)%
Bank property held for sale | ​ | 3,413 | ​ | Appraisal of collateral or real estate listing price | ​ | Appraisal adjustments | ​ | -6.2% to -64.9% (-27.3)%
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loans evaluated individually | $ | 2,686 |  | Appraisal of collateral |  | Appraisal adjustments |  | -2.9% to -100% (-57.8)%
OREO |  | 55 |  | Appraisal of collateral |  | Appraisal adjustments |  | -25.0% to -100% (-65.0)%
Bank property held for sale | ​ | 4,004 | ​ | Appraisal of collateral or real estate listing price | ​ | Appraisal adjustments | ​ | -6.2% to -71.3% (-40.7)%

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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=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 assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 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 (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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