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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
(in thousands) | ​ | Inputs | ​ | Inputs | ​ | Inputs | ​ | Fair Value
Available for sale securities: | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | — | ​ | $ | 212,390 | ​ | $ | — | ​ | $ | 212,390
US Government agency | ​ |  | — | ​ |  | 85,632 | ​ |  | — | ​ |  | 85,632
Private label | ​ |  | — | ​ |  | 19,709 | ​ |  | — | ​ |  | 19,709
Obligations of states and political subdivisions thereof | ​ |  | — | ​ |  | 169,004 | ​ |  | — | ​ |  | 169,004
Corporate bonds | ​ |  | — | ​ |  | 98,311 | ​ |  | — | ​ |  | 98,311
Derivative assets | ​ |  | — | ​ |  | 28,684 | ​ |  | 22 | ​ |  | 28,706
Derivative liabilities | ​ |  | — | ​ |  | (28,559) | ​ |  | (95) | ​ |  | (28,654)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
(in thousands) | ​ | Inputs | ​ | Inputs | ​ | Inputs | ​ | Fair Value
Available for sale securities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | — | ​ | $ | 321,969 | ​ | $ | — | ​ | $ | 321,969
US Government agency | ​ |  | — | ​ |  | 99,661 | ​ |  | — | ​ |  | 99,661
Private label | ​ |  | — | ​ |  | 19,533 | ​ |  | — | ​ |  | 19,533
Obligations of states and political subdivisions thereof | ​ |  | — | ​ |  | 142,006 | ​ |  | — | ​ |  | 142,006
Corporate bonds | ​ |  | — | ​ |  | 80,061 | ​ |  | — | ​ |  | 80,061
Derivative assets | ​ |  | — | ​ |  | 6,791 | ​ |  | 59 | ​ |  | 6,850
Derivative liabilities | ​ |  | — | ​ |  | (8,102) | ​ |  | (84) | ​ |  | (8,186)
Schedule of Changes in Level 3 Assets Measured on a Recurring Basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets (Liabilities)
​ | ​ | Interest Rate Lock | ​ | Forward
(in thousands) |  | Commitments |  | Commitments
December 31, 2018 | ​ | ​ | 8 | ​ | ​ | —
Realized gain (loss) recognized in non-interest income | ​ | ​ | 51 | ​ | ​ | (84)
December 31, 2019 | ​ | ​ | 59 | ​ | ​ | (84)
Realized loss recognized in non-interest income | ​ |  | (37) | ​ |  | (11)
December 31, 2020 | ​ | $ | 22 | ​ | $ | (95)
Schedule of Changes in Level 3 Liabilities Measured on a Recurring Basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets (Liabilities)
​ | ​ | Interest Rate Lock | ​ | Forward
(in thousands) |  | Commitments |  | Commitments
December 31, 2018 | ​ | ​ | 8 | ​ | ​ | —
Realized gain (loss) recognized in non-interest income | ​ | ​ | 51 | ​ | ​ | (84)
December 31, 2019 | ​ | ​ | 59 | ​ | ​ | (84)
Realized loss recognized in non-interest income | ​ |  | (37) | ​ |  | (11)
December 31, 2020 | ​ | $ | 22 | ​ | $ | (95)
Schedule of Quantitative Information, Valuation, Recurring | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ |  | Significant |
​ | ​ | Fair Value | ​ | Fair Value | ​ | ​ | ​ | ​ | ​ | Unobservable | ​
(in thousands, except ratios) |  | Dec 31, 2020 |  | Dec 31, 2019 | ​ | Valuation Techniques |  | Unobservable Inputs |  | Input Value | ​
Assets (Liabilities) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ |  | ​ |
Interest Rate Lock Commitment |  | $ | 22 | ​ | $ | 59 | ​ | Historical trend |  | Closing Ratio |  | ​ | 90 | %
​ | ​ |  | ​ | ​ |  | ​ | ​ | Pricing Model | ​ | Origination Costs, per loan | ​ | $ | 1.7 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​
Forward Commitments | ​ |  | (95) | ​ |  | (84) | ​ | Quoted prices for similar loans in active markets |  | Freddie Mac pricing system | ​ |  | Pair-off contract price | ​
Total | ​ | $ | (73) | ​ | $ | (25) | ​ |  |  |  | ​ |  |  | ​
Summary of Applicable Non-Recurring Fair Value Measurements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Fair Value Measurement
​ | ​ | December 31, 2020 | ​ | December 31, 2019 | ​ | December 31, 2020 | ​ | Date as of December 31, 2020
​ | ​ | Level 3 | ​ | Level 3 | ​ | Total | ​ | Level 3
(in thousands) |  | Inputs |  | Inputs |  | Gains (Losses) |  | Inputs
Assets | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Impaired loans | ​ | $ | 8,746 | ​ | $ | 9,625 | ​ | $ | 879 | ​ | December 2020
Capitalized servicing rights | ​ |  | 3,605 | ​ | ​ | 4,301 |  | ​ | 696 |  | December 2020
Other real estate owned | ​ |  | — | ​ | ​ | 2,236 |  | ​ | (355) |  | September 2020
Premises held for sale | ​ |  | 962 | ​ | ​ | 1,764 |  | ​ | 122 |  | December 2020
Total | ​ | $ | 13,313 | ​ | $ | 17,926 | ​ | $ | 1,342 |  |
Schedule of Quantitative Information, Valuation, Non-recurring | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
(in thousands, except ratios) |  | Fair Value Dec 31, 2020 |  | Valuation Techniques |  | Unobservable Inputs |  | Range (Weighted Average)(a) |
Assets |  | ​ |  |  |  |  |  | ​ | ​ |  | ​
Impaired loans | ​ | $ | 6,128 |  | Fair value of collateral-appraised value |  | Loss severity | ​ | ​ | 0% to 70% | ​
​ | ​ | ​ | ​ | ​ | ​ |  | Appraised value | ​ | ​ | $0 to $1,730 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ |  | 2,618 |  | Discount cash flow |  | Discount rate |  | ​ | 3.50% to 9.50% | ​
​ | ​ | ​ | ​ | ​ | ​ |  | Cash flows | ​ | ​ | $19 to $953 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Capitalized servicing rights | ​ |  | 3,605 |  | Discounted cash flow |  | Constant prepayment rate (CPR) |  | ​ | 18.53% | ​
​ | ​ |  |  |  |  |  | Discount rate |  | ​ | 10.05% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Premises held for sale | ​ |  | 962 |  | Fair value of asset less selling costs |  | Appraised value | ​ | ​ | $220 to $386 | ​
​ | ​ |  |  |  |  |  | Selling Costs |  | ​ | 6% | ​
Total | ​ | $ | 13,313 |  |  |  |  |  | ​ |  | ​
(a) | Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individuals properties.
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands, except ratios) |  | Fair Value Dec 31, 2019 |  | Valuation Techniques |  | Unobservable Inputs |  | Range (Weighted Average)(a) | ​
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | 6,137 | ​ | Fair value of collateral-appraised value | ​ | Loss severity | ​ | ​ | 0% to 55.00% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Appraised value | ​ | ​ | $0 to $6,915 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ |  | 3,488 | ​ | Discount cash flow | ​ | Discount rate |  | ​ | 2.88% to 9.50% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Cash flows | ​ | ​ | $22 to $1,002 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Capitalized servicing rights | ​ |  | 4,301 | ​ | Discounted cash flow | ​ | Constant prepayment rate (CPR) |  | ​ | 9.95% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Discount rate |  | ​ | 10.07% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other real estate owned | ​ |  | 2,236 | ​ | Fair value of collateral less selling costs | ​ | Appraised value |  | ​ | $2,695 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Selling Costs | ​ | ​ | 10% to 20% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Premises held for sale | ​ |  | 1,764 | ​ | Fair value of asset less selling costs | ​ | Appraised value |  | ​ | $136 to $527 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Selling Costs |  | ​ | 6% | ​
Total | ​ | $ | 17,926 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(a) | Where dollar amounts are disclosed, the amounts represent the lowest and highest fair value of the respective assets in the population except for adjustments for market/property conditions, which represents the range of adjustments to individuals properties.
Summary of Estimated Fair Values, and Related Carrying Amounts, of Financial Instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Carrying | ​ | Fair | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amount |  | Value |  | Level 1 |  | Level 2 |  | Level 3
Financial Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash and cash equivalents | ​ | $ | 226,007 | ​ | $ | 226,007 | ​ | $ | 226,007 | ​ | $ | — | ​ | $ | —
Securities available for sale | ​ |  | 585,046 | ​ |  | 585,046 | ​ |  | — | ​ |  | 585,046 | ​ |  | —
FHLB stock | ​ |  | 14,036 | ​ |  | 14,036 | ​ |  | — | ​ |  | 14,036 | ​ |  | —
Loans held for sale | ​ | ​ | 23,988 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 24,163
Net loans | ​ |  | 2,543,803 | ​ |  | 2,547,970 | ​ |  | — | ​ |  | — | ​ |  | 2,547,970
Accrued interest receivable | ​ |  | 2,964 | ​ |  | 2,964 | ​ |  | — | ​ |  | 2,964 | ​ |  | —
Cash surrender value of bank-owned life insurance policies | ​ |  | 77,870 | ​ |  | 77,870 | ​ |  | — | ​ |  | 77,870 | ​ |  | —
Derivative assets | ​ |  | 28,706 | ​ |  | 28,706 | ​ |  | — | ​ |  | 28,684 | ​ |  | 22
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial Liabilities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Non-maturity deposits | ​ | $ | 2,207,854 | ​ | $ | 2,122,222 | ​ | $ | — | ​ | $ | 2,122,222 | ​ | $ | —
Time deposits | ​ | ​ | 698,361 | ​ | ​ | 694,700 | ​ | ​ | — | ​ | ​ | 694,700 | ​ | ​ | —
Securities sold under agreements to repurchase | ​ | ​ | 27,779 | ​ | ​ | 27,779 | ​ | ​ | — | ​ | ​ | 27,779 | ​ | ​ | —
FHLB advances | ​ |  | 248,283 | ​ |  | 252,698 | ​ |  | — | ​ |  | 252,698 | ​ |  | —
Subordinated borrowings | ​ |  | 59,961 | ​ |  | 57,091 | ​ |  | — | ​ |  | 57,091 | ​ |  | —
Derivative liabilities | ​ |  | 28,654 | ​ |  | 28,654 | ​ |  | — | ​ |  | 28,559 | ​ |  | 95
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | Carrying | ​ | Fair | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amount |  | Value |  | Level 1 |  | Level 2 |  | Level 3
Financial Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash and cash equivalents | ​ | $ | 56,910 | ​ | $ | 56,910 | ​ | $ | 56,910 | ​ | $ | — | ​ | $ | —
Securities available for sale | ​ |  | 663,230 | ​ |  | 663,230 | ​ |  | — | ​ |  | 663,230 | ​ |  | —
FHLB stock | ​ |  | 20,679 | ​ |  | 20,679 | ​ |  | — | ​ |  | 20,679 | ​ |  | —
Loans held for sale | ​ | ​ | 6,499 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,572
Net loans | ​ |  | 2,625,739 | ​ |  | 2,634,147 | ​ |  | — | ​ |  | — | ​ |  | 2,634,147
Accrued interest receivable | ​ |  | 3,294 | ​ |  | 3,294 | ​ |  | — | ​ |  | 3,294 | ​ |  | —
Cash surrender value of bank-owned life insurance policies | ​ |  | 75,863 | ​ |  | 75,863 | ​ |  | — | ​ |  | 75,863 | ​ |  | —
Derivative assets | ​ |  | 6,850 | ​ |  | 6,850 | ​ |  | — | ​ |  | 6,791 | ​ |  | 59
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial Liabilities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Non-maturity deposits | ​ | $ | 1,763,116 | ​ | $ | 1,751,481 | ​ | $ | — | ​ | $ | 1,751,481 | ​ | $ | —
Time deposits | ​ | ​ | 932,635 | ​ | ​ | 932,886 | ​ | ​ | — | ​ | ​ | 932,886 | ​ | ​ | —
Short-term other borrowings | ​ |  | 44,832 | ​ |  | 44,831 | ​ |  | — | ​ |  | 44,831 | ​ |  | —
FHLB advances | ​ |  | 426,564 | ​ |  | 425,989 | ​ |  | — | ​ |  | 425,989 | ​ |  | —
Subordinated borrowings | ​ |  | 59,920 | ​ |  | 59,920 | ​ |  | — | ​ |  | 59,920 | ​ |  | —
Derivative liabilities | ​ |  | 8,186 | ​ |  | 8,186 | ​ |  | — | ​ |  | 8,102 | ​ |  | 84

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