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Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale securities:
Total available-for-sale securities	$ 1,212,698,000	$ 1,218,985,000
Equity securities, at fair value	362,000	311,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale securities:
Total available-for-sale securities	223,545,000	220,527,000
Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	284,997,000	287,698,000
Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	624,272,000	627,880,000
Other Securities
Available-for-sale securities:
Total available-for-sale securities	79,884,000	82,880,000
Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	1,212,698,000	1,218,985,000
Equity securities, at fair value	311,000	362,000
Derivative assets: interest rate swaps	4,253,000	3,353,000
Total assets	1,216,413,000	1,223,549,000
Derivative liabilities: interest swaps	3,100,000	2,525,000
Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale securities:
Total available-for-sale securities	220,527,000	223,545,000
Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	287,698,000	284,997,000
Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	624,272,000	627,880,000
Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	79,884,000	82,880,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale securities:
Total available-for-sale securities	0	0
Equity securities, at fair value	362,000	311,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	0	0
Equity securities, at fair value	311,000	362,000
Derivative assets: interest rate swaps	0	0
Total assets	362,000	311,000
Derivative liabilities: interest swaps	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale securities:
Total available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	0	0
Significant Other Observable Inputs (Level 2)
Available-for-sale securities:
Total available-for-sale securities	1,202,698,000	1,209,736,000
Equity securities, at fair value	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	1,202,688,000	1,209,735,000
Equity securities, at fair value	0	0
Derivative assets: interest rate swaps	4,253,000	3,353,000
Total assets	1,206,041,000	1,213,988,000
Derivative liabilities: interest swaps	3,100,000	2,525,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale securities:
Total available-for-sale securities	220,527,000	223,545,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	287,698,000	284,997,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	624,272,000	627,880,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	69,874,000	73,630,000
Significant Unobservable Inputs (Level 3)
Available-for-sale securities:
Total available-for-sale securities	10,000,000	9,250,000
Equity securities, at fair value	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	10,010,000	9,250,000
Equity securities, at fair value	0	0
Derivative assets: interest rate swaps	0	0
Total assets	10,010,000	9,250,000
Derivative liabilities: interest swaps	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale securities:
Total available-for-sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	$ 10,010,000	$ 9,250,000

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