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, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,791,044,000	$ 1,714,082,000
Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	104,497,000	171,467,000
Total Loans, Fiscal Year Before Latest Fiscal Year	157,001,000	114,199,000
Total Loans, Two Years Before Latest Fiscal Year	105,326,000	167,819,000
Total Loans, Three Years Before Latest Fiscal Year	160,951,000	133,394,000
Total Loans, Four Years Before Latest Fiscal Year	117,846,000	81,861,000
Total Loans, Prior	331,574,000	277,003,000
Revolving Loans Amortized Cost Basis	78,165,000	76,688,000
Total	1,055,360,000	1,022,431,000
Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	104,497,000	171,327,000
Total Loans, Fiscal Year Before Latest Fiscal Year	156,862,000	113,922,000
Total Loans, Two Years Before Latest Fiscal Year	105,061,000	167,103,000
Total Loans, Three Years Before Latest Fiscal Year	160,281,000	130,222,000
Total Loans, Four Years Before Latest Fiscal Year	114,728,000	80,456,000
Total Loans, Prior	319,513,000	265,868,000
Revolving Loans Amortized Cost Basis	75,126,000	73,768,000
Total	1,036,068,000	1,002,666,000
Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		5,000
Total Loans, Fiscal Year Before Latest Fiscal Year	4,000
Total Loans, Two Years Before Latest Fiscal Year		287,000
Total Loans, Three Years Before Latest Fiscal Year	278,000
Total Loans, Prior	2,532,000	3,154,000
Revolving Loans Amortized Cost Basis	164,000	164,000
Total	2,978,000	3,610,000
Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		135,000
Total Loans, Fiscal Year Before Latest Fiscal Year	135,000	277,000
Total Loans, Two Years Before Latest Fiscal Year	265,000	429,000
Total Loans, Three Years Before Latest Fiscal Year	392,000	3,172,000
Total Loans, Four Years Before Latest Fiscal Year	3,118,000	1,405,000
Total Loans, Prior	9,529,000	7,981,000
Revolving Loans Amortized Cost Basis	2,875,000	2,756,000
Total	16,314,000	16,155,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	736,969,000	716,875,000
Commercial Real Estate Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	60,518,000	102,913,000
Total Loans, Fiscal Year Before Latest Fiscal Year	101,368,000	74,242,000
Total Loans, Two Years Before Latest Fiscal Year	71,736,000	122,143,000
Total Loans, Three Years Before Latest Fiscal Year	118,502,000	107,181,000
Total Loans, Four Years Before Latest Fiscal Year	96,313,000	62,346,000
Total Loans, Prior	268,444,000	226,821,000
Revolving Loans Amortized Cost Basis	20,088,000	21,229,000
Total	736,969,000	716,875,000
Current period gross charge-offs, Prior	49,000
Current period gross charge-offs, Total	49,000
Commercial Real Estate Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	60,518,000	102,773,000
Total Loans, Fiscal Year Before Latest Fiscal Year	101,229,000	74,242,000
Total Loans, Two Years Before Latest Fiscal Year	71,736,000	121,881,000
Total Loans, Three Years Before Latest Fiscal Year	118,247,000	104,720,000
Total Loans, Four Years Before Latest Fiscal Year	93,843,000	60,941,000
Total Loans, Prior	257,872,000	217,435,000
Revolving Loans Amortized Cost Basis	19,688,000	20,829,000
Total	723,133,000	702,821,000
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		5,000
Total Loans, Fiscal Year Before Latest Fiscal Year	4,000
Total Loans, Two Years Before Latest Fiscal Year		262,000
Total Loans, Three Years Before Latest Fiscal Year	255,000
Total Loans, Prior	1,901,000	2,148,000
Total	2,160,000	2,415,000
Commercial Real Estate Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		135,000
Total Loans, Fiscal Year Before Latest Fiscal Year	135,000
Total Loans, Three Years Before Latest Fiscal Year		2,461,000
Total Loans, Four Years Before Latest Fiscal Year	2,470,000	1,405,000
Total Loans, Prior	8,671,000	7,238,000
Revolving Loans Amortized Cost Basis	400,000	400,000
Total	11,676,000	11,639,000
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	62,077,000	63,488,000
Agricultural Real Estate Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	1,817,000	6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year	6,081,000	3,756,000
Total Loans, Two Years Before Latest Fiscal Year	3,741,000	12,036,000
Total Loans, Three Years Before Latest Fiscal Year	11,712,000	3,960,000
Total Loans, Four Years Before Latest Fiscal Year	3,843,000	7,148,000
Total Loans, Prior	34,384,000	29,811,000
Revolving Loans Amortized Cost Basis	499,000	520,000
Total	62,077,000	63,488,000
Agricultural Real Estate Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	1,817,000	6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year	6,081,000	3,756,000
Total Loans, Two Years Before Latest Fiscal Year	3,741,000	12,036,000
Total Loans, Three Years Before Latest Fiscal Year	11,712,000	3,960,000
Total Loans, Four Years Before Latest Fiscal Year	3,843,000	7,148,000
Total Loans, Prior	33,955,000	29,038,000
Revolving Loans Amortized Cost Basis	324,000	336,000
Total	61,473,000	62,531,000
Agricultural Real Estate Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Prior	429,000	773,000
Revolving Loans Amortized Cost Basis	150,000	150,000
Total	579,000	923,000
Agricultural Real Estate Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving Loans Amortized Cost Basis	25,000	34,000
Total	25,000	34,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	229,182,000	211,991,000
Commercial Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	40,841,000	57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year	46,075,000	34,365,000
Total Loans, Two Years Before Latest Fiscal Year	28,327,000	29,919,000
Total Loans, Three Years Before Latest Fiscal Year	27,823,000	19,874,000
Total Loans, Four Years Before Latest Fiscal Year	15,604,000	10,233,000
Total Loans, Prior	23,072,000	15,891,000
Revolving Loans Amortized Cost Basis	47,440,000	43,770,000
Total	229,182,000	211,991,000
Current period gross charge-offs, Fiscal Year Before Latest Fiscal Year		11,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year		8,000
Current period gross charge-offs, Prior		51,000
Current period gross charge-offs, Revolving loans amortized cost basis		30,000
Current period gross charge-offs, Total		100,000
Commercial Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	40,841,000	57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year	46,075,000	34,088,000
Total Loans, Two Years Before Latest Fiscal Year	28,062,000	29,465,000
Total Loans, Three Years Before Latest Fiscal Year	27,408,000	19,163,000
Total Loans, Four Years Before Latest Fiscal Year	14,956,000	10,233,000
Total Loans, Prior	22,119,000	15,042,000
Revolving Loans Amortized Cost Basis	46,451,000	42,906,000
Total	225,912,000	208,836,000
Commercial 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		25,000
Total Loans, Three Years Before Latest Fiscal Year	23,000
Total Loans, Prior	95,000	106,000
Revolving Loans Amortized Cost Basis	14,000	14,000
Total	132,000	145,000
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		277,000
Total Loans, Two Years Before Latest Fiscal Year	265,000	429,000
Total Loans, Three Years Before Latest Fiscal Year	392,000	711,000
Total Loans, Four Years Before Latest Fiscal Year	648,000
Total Loans, Prior	858,000	743,000
Revolving Loans Amortized Cost Basis	975,000	850,000
Total	3,138,000	3,010,000
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	27,132,000	30,077,000
Other Agricultural Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	1,321,000	4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year	3,477,000	1,836,000
Total Loans, Two Years Before Latest Fiscal Year	1,522,000	3,721,000
Total Loans, Three Years Before Latest Fiscal Year	2,914,000	2,379,000
Total Loans, Four Years Before Latest Fiscal Year	2,086,000	2,134,000
Total Loans, Prior	5,674,000	4,480,000
Revolving Loans Amortized Cost Basis	10,138,000	11,169,000
Total	27,132,000	30,077,000
Current period gross charge-offs, Revolving loans Converted to Term	48,000
Other Agricultural Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	1,321,000	4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year	3,477,000	1,836,000
Total Loans, Two Years Before Latest Fiscal Year	1,522,000	3,721,000
Total Loans, Three Years Before Latest Fiscal Year	2,914,000	2,379,000
Total Loans, Four Years Before Latest Fiscal Year	2,086,000	2,134,000
Total Loans, Prior	5,567,000	4,353,000
Revolving Loans Amortized Cost Basis	8,663,000	9,697,000
Total	25,550,000	28,478,000
Other Agricultural Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Prior	107,000	127,000
Total	107,000	127,000
Other Agricultural Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving Loans Amortized Cost Basis	1,475,000	1,472,000
Total	$ 1,475,000	$ 1,472,000

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