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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 100,009 | $ 102,346 |
Interest-bearing deposits | 256,572 | 19,510 |
Securities available for sale | 831,223 | 902,292 |
Debt Securities, Held-to-maturity | 361,844 | 337,123 |
Other investments | 12,227 | 16,761 |
Premises and Equipment | 442 |  |
Loans | 6,761,183 | 6,189,148 | $ 5,774,139
Deposits | 7,438,666 | 6,677,615 |
Short-term borrowings | 117,373 | 201,853 | $ 721,823
Long-term debt | 56,258 | 56,917 |
Subordinated Debentures outstanding, Amount | 170,612 | 170,450 |
Capital lease obligation | 6,385 | 6,815 |
Loans Held for Sale | 33,436 | 15,989 |
Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale | 0 | 0 |
Other investments | 0 |  |
Premises and Equipment | 0 |  |
Loans Held for Sale | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale | 831,223 | 902,292 |
Other investments | 10,557 | 15,091 |
Premises and Equipment | 442 |  |
Loans Held for Sale | 33,436 | 15,989 |
Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale | 0 | 0 |
Premises and Equipment | 0 |  |
Loans Held for Sale | 0 | 0 |
Carrying Amount [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 100,009 | 102,346 |
Interest-bearing deposits | 256,572 | 19,510 |
Securities available for sale | 831,223 | 902,292 |
Debt Securities, Held-to-maturity | 361,844 | 337,123 |
Other investments | 12,227 | 16,761 |
Loans held for sale | 33,436 | 15,989 |
Loans | 6,761,183 | 6,189,148 |
Deposits | 7,438,666 | 6,677,615 |
Short-term borrowings | 117,373 | 201,853 |
Long-term debt | 56,258 | 56,917 |
Subordinated Debentures outstanding, Amount | 170,612 | 170,450 |
Capital lease obligation | 6,385 | 6,815 |
Estimated Fair Value [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 100,009 | 102,346 |
Interest-bearing deposits | 256,572 | 19,510 |
Securities available for sale | 831,223 | 902,292 |
Debt Securities, Held-to-maturity | 369,851 | 338,718 |
Other investments | 12,227 | 16,761 |
Loans held for sale | 33,436 | 15,989 |
Loans | 7,202,763 | 6,393,872 |
Deposits | 7,440,906 | 6,677,595 |
Short-term borrowings | 117,037 | 201,151 |
Long-term debt | 57,881 | 58,051 |
Subordinated Debentures outstanding, Amount | 165,665 | 171,772 |
Capital lease obligation | 6,385 | 6,815 |
Estimated Fair Value [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 100,009 | 102,346 |
Interest-bearing deposits | 256,572 | 19,510 |
Securities available for sale | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 0 | 0 |
Loans held for sale | 0 | 0 |
Loans | 0 | 0 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated Debentures outstanding, Amount | 0 | 0 |
Capital lease obligation | 0 | 0 |
Estimated Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 |  |
Interest-bearing deposits | 0 | 0 |
Securities available for sale | 831,223 | 902,292 |
Debt Securities, Held-to-maturity | 369,851 | 338,718 |
Other investments | 10,557 | 15,091 |
Loans held for sale | 33,436 | 15,989 |
Loans | 35,543 | 12,267 |
Deposits | 7,440,906 | 6,677,595 |
Short-term borrowings | 117,037 | 201,151 |
Long-term debt | 57,881 | 58,051 |
Subordinated Debentures outstanding, Amount | 0 | 0 |
Capital lease obligation | 6,385 | 6,815 |
Estimated Fair Value [Member] | Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 | 0 |
Interest-bearing deposits | 0 | 0 |
Securities available for sale | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 1,670 | 1,670 |
Loans held for sale | 0 | 0 |
Loans | 7,167,220 | 6,381,605 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated Debentures outstanding, Amount | 165,665 | 171,772 |
Capital lease obligation | $ 0 | $ 0 |

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