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Loans and Allowance for Credit Losses (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) credit_card | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) credit_card property | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) property
Loan Receivables: |  |  |  |  |
Loans, net | $ 4,675,240,000 |  | $ 4,675,240,000 |  | $ 4,583,659,000
Subsequent defaults on loan modifications | 0 | $ 0 | 0 | $ 0 |
Federal National Mortgage Association (FNMA) |  |  |  |  |
Loan Receivables: |  |  |  |  |
Loans, net | 368,000,000.0 |  | 368,000,000.0 |  |
Federal Home Loan Mortgage Corporation (FHLMC) |  |  |  |  |
Loan Receivables: |  |  |  |  |
Loans, net | 118,500,000 |  | 118,500,000 |  |
Residential real estate |  |  |  |  |
Loan Receivables: |  |  |  |  |
Consumer mortgage loans | $ 127,000 |  | $ 127,000 |  | $ 175,000
Number of residential real estate property | property |  |  | 0 |  | 0
Credit cards |  |  |  |  |
Loan Receivables: |  |  |  |  |
Number of loans downgraded | credit_card | 7 |  | 7 |  |
Commercial real estate |  |  |  |  |
Loan Receivables: |  |  |  |  |
Financing receivable, excluding accrued interest, non-accrual, modified in period, amount |  |  | $ 98,000 |  |
Consumer mortgage loans | $ 552,000 |  | 552,000 |  |
Commercial |  |  |  |  |
Loan Receivables: |  |  |  |  |
Financing receivable, excluding accrued interest, non-accrual, modified in period, amount |  |  | 216,000 |  |
Northwest Bank Branches |  |  |  |  |
Loan Receivables: |  |  |  |  |
Fees | 3,400,000 |  | 3,400,000 |  | $ 2,200,000
Severn Bancorp, Inc. |  |  |  |  |
Loan Receivables: |  |  |  |  |
Loans acquired, net of related discount | 3,600,000 |  | 3,600,000 |  | 4,700,000
Loans acquired as part of acquisition | 263,400,000 |  | 263,400,000 |  | 297,900,000
The Community Financial Corporation |  |  |  |  |
Loan Receivables: |  |  |  |  |
Business combination, loan acquired | 1,520,000,000 |  | 1,520,000,000 |  | 1,640,000,000
Loans acquired, net of related discount | $ 92,300,000 |  | $ 92,300,000 |  | $ 108,400,000

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