Loans Receivable and Allowance for Credit Losses (Summary of Recorded Investment by Internal Risk Rating Systems) (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,641,531,000	$ 1,603,877,000
Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	61,163,000	134,225,000
Total Loans, Fiscal Year Before Latest Fiscal Year	124,051,000	194,063,000
Total Loans, Two Years Before Latest Fiscal Year	186,285,000	146,073,000
Total Loans, Three Years Before Latest Fiscal Year	143,835,000	94,987,000
Total Loans, Four Years Before Latest Fiscal Year	88,885,000	93,173,000
Total Loans, Prior	309,353,000	239,295,000
Revolving Loans Amortized Cost Basis	72,542,000	69,741,000
Total	986,114,000	971,557,000
Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	61,163,000	132,372,000
Total Loans, Fiscal Year Before Latest Fiscal Year	123,463,000	191,606,000
Total Loans, Two Years Before Latest Fiscal Year	179,762,000	145,229,000
Total Loans, Three Years Before Latest Fiscal Year	136,951,000	90,219,000
Total Loans, Four Years Before Latest Fiscal Year	87,417,000	92,513,000
Total Loans, Prior	299,241,000	229,990,000
Revolving Loans Amortized Cost Basis	67,910,000	63,589,000
Total	955,907,000	945,518,000
Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		1,853,000
Total Loans, Fiscal Year Before Latest Fiscal Year	588,000	1,823,000
Total Loans, Two Years Before Latest Fiscal Year	734,000	502,000
Total Loans, Three Years Before Latest Fiscal Year	3,110,000	1,650,000
Total Loans, Four Years Before Latest Fiscal Year		505,000
Total Loans, Prior	3,882,000	6,835,000
Revolving Loans Amortized Cost Basis	2,637,000	2,652,000
Total	10,951,000	15,820,000
Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Fiscal Year Before Latest Fiscal Year		634,000
Total Loans, Two Years Before Latest Fiscal Year	5,789,000	342,000
Total Loans, Three Years Before Latest Fiscal Year	3,774,000	3,118,000
Total Loans, Four Years Before Latest Fiscal Year	1,468,000	155,000
Total Loans, Prior	6,230,000	2,470,000
Revolving Loans Amortized Cost Basis	1,995,000	3,500,000
Total	19,256,000	10,219,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	685,212,000	675,156,000
Commercial Real Estate Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	26,939,000	79,796,000
Total Loans, Fiscal Year Before Latest Fiscal Year	79,865,000	132,359,000
Total Loans, Two Years Before Latest Fiscal Year	132,750,000	112,345,000
Total Loans, Three Years Before Latest Fiscal Year	114,302,000	68,724,000
Total Loans, Four Years Before Latest Fiscal Year	66,749,000	72,516,000
Total Loans, Prior	250,163,000	194,505,000
Revolving Loans Amortized Cost Basis	14,444,000	14,911,000
Total	685,212,000	675,156,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year		112,000
Current period gross charge-offs, Prior		42,000
Current period gross charge-offs, Total		154,000
Commercial Real Estate Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	26,939,000	78,496,000
Total Loans, Fiscal Year Before Latest Fiscal Year	79,565,000	131,948,000
Total Loans, Two Years Before Latest Fiscal Year	129,495,000	112,102,000
Total Loans, Three Years Before Latest Fiscal Year	108,654,000	65,949,000
Total Loans, Four Years Before Latest Fiscal Year	65,325,000	72,480,000
Total Loans, Prior	241,147,000	186,116,000
Revolving Loans Amortized Cost Basis	14,150,000	13,332,000
Total	665,275,000	660,423,000
Commercial Real Estate Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		1,300,000
Total Loans, Fiscal Year Before Latest Fiscal Year	300,000	411,000
Total Loans, Two Years Before Latest Fiscal Year	311,000	243,000
Total Loans, Three Years Before Latest Fiscal Year	2,431,000	1,331,000
Total Loans, Prior	2,835,000	6,157,000
Revolving Loans Amortized Cost Basis	294,000	1,579,000
Total	6,171,000	11,021,000
Commercial Real Estate Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Two Years Before Latest Fiscal Year	2,944,000
Total Loans, Three Years Before Latest Fiscal Year	3,217,000	1,444,000
Total Loans, Four Years Before Latest Fiscal Year	1,424,000	36,000
Total Loans, Prior	6,181,000	2,232,000
Total	13,766,000	3,712,000
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	60,963,000	63,859,000
Agricultural Real Estate Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	2,002,000	2,635,000
Total Loans, Fiscal Year Before Latest Fiscal Year	2,515,000	13,017,000
Total Loans, Two Years Before Latest Fiscal Year	12,261,000	5,433,000
Total Loans, Three Years Before Latest Fiscal Year	4,132,000	8,624,000
Total Loans, Four Years Before Latest Fiscal Year	7,430,000	8,145,000
Total Loans, Prior	32,029,000	25,333,000
Revolving Loans Amortized Cost Basis	594,000	672,000
Total	60,963,000	63,859,000
Agricultural Real Estate Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	2,002,000	2,635,000
Total Loans, Fiscal Year Before Latest Fiscal Year	2,515,000	12,509,000
Total Loans, Two Years Before Latest Fiscal Year	12,261,000	5,433,000
Total Loans, Three Years Before Latest Fiscal Year	4,132,000	7,606,000
Total Loans, Four Years Before Latest Fiscal Year	7,430,000	7,746,000
Total Loans, Prior	31,241,000	24,654,000
Revolving Loans Amortized Cost Basis	444,000	522,000
Total	60,025,000	61,105,000
Agricultural Real Estate Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Four Years Before Latest Fiscal Year		399,000
Total Loans, Prior	788,000	490,000
Revolving Loans Amortized Cost Basis	150,000	150,000
Total	938,000	1,039,000
Agricultural Real Estate Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Fiscal Year Before Latest Fiscal Year		508,000
Total Loans, Three Years Before Latest Fiscal Year		1,018,000
Total Loans, Prior		189,000
Total		1,715,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	208,658,000	200,576,000
Commercial Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	30,567,000	49,124,000
Total Loans, Fiscal Year Before Latest Fiscal Year	39,263,000	43,401,000
Total Loans, Two Years Before Latest Fiscal Year	36,732,000	25,042,000
Total Loans, Three Years Before Latest Fiscal Year	22,693,000	14,542,000
Total Loans, Four Years Before Latest Fiscal Year	12,059,000	9,934,000
Total Loans, Prior	21,883,000	15,621,000
Revolving Loans Amortized Cost Basis	45,461,000	42,912,000
Total	208,658,000	200,576,000
Current period gross charge-offs, Fiscal Year Before Latest Fiscal Year		32,000
Current period gross charge-offs, Two Years Before Latest Fiscal Year		24,000
Current period gross charge-offs, Three Years Before Latest Fiscal Year		4,856,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year	4,000
Current period gross charge-offs, Prior	51,000	41,000
Current period gross charge-offs, Revolving loans amortized cost basis	30,000
Current period gross charge-offs, Total	85,000	4,953,000
Commercial Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	30,567,000	48,571,000
Total Loans, Fiscal Year Before Latest Fiscal Year	38,975,000	41,863,000
Total Loans, Two Years Before Latest Fiscal Year	33,464,000	24,443,000
Total Loans, Three Years Before Latest Fiscal Year	21,458,000	13,752,000
Total Loans, Four Years Before Latest Fiscal Year	12,015,000	9,914,000
Total Loans, Prior	21,717,000	15,384,000
Revolving Loans Amortized Cost Basis	42,745,000	38,644,000
Total	200,941,000	192,571,000
Commercial Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		553,000
Total Loans, Fiscal Year Before Latest Fiscal Year	288,000	1,412,000
Total Loans, Two Years Before Latest Fiscal Year	423,000	257,000
Total Loans, Three Years Before Latest Fiscal Year	678,000	134,000
Total Loans, Four Years Before Latest Fiscal Year		20,000
Total Loans, Prior	117,000	188,000
Revolving Loans Amortized Cost Basis	721,000	768,000
Total	2,227,000	3,332,000
Commercial Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Fiscal Year Before Latest Fiscal Year		126,000
Total Loans, Two Years Before Latest Fiscal Year	2,845,000	342,000
Total Loans, Three Years Before Latest Fiscal Year	557,000	656,000
Total Loans, Four Years Before Latest Fiscal Year	44,000
Total Loans, Prior	49,000	49,000
Revolving Loans Amortized Cost Basis	1,995,000	3,500,000
Total	5,490,000	4,673,000
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	31,281,000	31,966,000
Other Agricultural Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	1,655,000	2,670,000
Total Loans, Fiscal Year Before Latest Fiscal Year	2,408,000	5,286,000
Total Loans, Two Years Before Latest Fiscal Year	4,542,000	3,253,000
Total Loans, Three Years Before Latest Fiscal Year	2,708,000	3,097,000
Total Loans, Four Years Before Latest Fiscal Year	2,647,000	2,578,000
Total Loans, Prior	5,278,000	3,836,000
Revolving Loans Amortized Cost Basis	12,043,000	11,246,000
Total	31,281,000	31,966,000
Other Agricultural Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	1,655,000	2,670,000
Total Loans, Fiscal Year Before Latest Fiscal Year	2,408,000	5,286,000
Total Loans, Two Years Before Latest Fiscal Year	4,542,000	3,251,000
Total Loans, Three Years Before Latest Fiscal Year	2,707,000	2,912,000
Total Loans, Four Years Before Latest Fiscal Year	2,647,000	2,373,000
Total Loans, Prior	5,136,000	3,836,000
Revolving Loans Amortized Cost Basis	10,571,000	11,091,000
Total	29,666,000	31,419,000
Other Agricultural Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Two Years Before Latest Fiscal Year		2,000
Total Loans, Three Years Before Latest Fiscal Year	1,000	185,000
Total Loans, Four Years Before Latest Fiscal Year		86,000
Total Loans, Prior	142,000
Revolving Loans Amortized Cost Basis	1,472,000	155,000
Total	$ 1,615,000	428,000
Other Agricultural Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Four Years Before Latest Fiscal Year		119,000
Total		$ 119,000

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