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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 83,989 | $ 100,009 |
Interest-bearing deposits | 420,645 | 256,572 |
Securities available for sale, at fair value | 1,043,258 | 831,223 |
Debt Securities, Held-to-maturity | 407,833 | 361,844 |
Other investments | 13,445 | 12,227 |
Loans and Leases Receivable, Net of Deferred Income | 6,736,894 | 6,761,183 | $ 6,313,944
Deposits | 7,869,256 | 7,438,666 |
Short-term borrowings | 110,762 | 117,373 |
Subordinated debt | 170,653 | 170,612 |
Long-term debt | 56,089 | 56,258 |
Capital Lease Obligations | 6,270 | 6,385 |
Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale, at fair value | 0 | 0 |
Other investments | 0 | 0 |
Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale, at fair value | 1,043,258 | 831,223 |
Other investments | 11,775 | 10,557 |
Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale, at fair value | 0 | 0 |
Other investments | 1,670 | 1,670 |
Carrying Amount [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 83,989 | 100,009 |
Interest-bearing deposits | 420,645 | 256,572 |
Securities available for sale, at fair value | 1,043,258 | 831,223 |
Debt Securities, Held-to-maturity | 407,833 | 361,844 |
Other investments | 13,445 | 12,227 |
Loans Held for sale, Amount | 20,604 | 33,436 |
Loans and Leases Receivable, Net of Deferred Income | 6,736,894 | 6,761,183 |
Deposits | 7,869,256 | 7,438,666 |
Short-term borrowings | 110,762 | 117,373 |
Subordinated debt | 170,653 | 170,612 |
Long-term debt | 56,089 | 56,258 |
Capital Lease Obligations | 6,270 | 6,385 |
Estimate of Fair Value Measurement [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 83,989 | 100,009 |
Interest-bearing deposits | 420,645 | 256,572 |
Securities available for sale, at fair value | 1,043,258 | 831,223 |
Debt Securities, Held-to-maturity | 408,118 | 369,851 |
Other investments | 13,445 | 12,227 |
Loans Held for sale, Amount | 20,604 | 33,436 |
Loans and Leases Receivable, Net of Deferred Income | 7,111,000 | 7,202,763 |
Deposits | 7,869,730 | 7,440,906 |
Short-term borrowings | 110,446 | 117,037 |
Subordinated debt | 172,619 | 165,665 |
Long-term debt | 57,276 | 57,881 |
Capital Lease Obligations | 6,270 | 6,385 |
Estimate of Fair Value Measurement [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 83,989 | 100,009 |
Interest-bearing deposits | 420,645 | 256,572 |
Securities available for sale, at fair value | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 0 | 0 |
Loans Held for sale, Amount | 0 | 0 |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Subordinated debt | 0 | 0 |
Long-term debt | 0 | 0 |
Capital Lease Obligations | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Level 2 [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, at fair value | 1,043,258 | 831,223 |
Debt Securities, Held-to-maturity | 408,118 | 369,851 |
Other investments | 11,775 | 10,557 |
Loans Held for sale, Amount | 20,604 | 33,436 |
Loans and Leases Receivable, Net of Deferred Income | 29,467 | 35,543 |
Deposits | 7,869,730 | 7,440,906 |
Short-term borrowings | 110,446 | 117,037 |
Subordinated debt | 0 | 0 |
Long-term debt | 57,276 | 57,881 |
Capital Lease Obligations | 6,270 | 6,385 |
Estimate of Fair Value Measurement [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, at fair value | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 1,670 | 1,670 |
Loans Held for sale, Amount | 0 | 0 |
Loans and Leases Receivable, Net of Deferred Income | 7,081,533 | 7,167,220 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Subordinated debt | 172,619 | 165,665 |
Long-term debt | 0 | 0 |
Capital Lease Obligations | $ 0 | $ 0 |

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