Loans Receivable and Allowance for Credit Losses (Summary of Recorded Investment by Internal Risk Rating Systems) (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,771,682,000	$ 1,714,082,000
Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	57,899,000	171,467,000
Total Loans, Fiscal Year Before Latest Fiscal Year	162,557,000	114,199,000
Total Loans, Two Years Before Latest Fiscal Year	108,919,000	167,819,000
Total Loans, Three Years Before Latest Fiscal Year	164,865,000	133,394,000
Total Loans, Four Years Before Latest Fiscal Year	130,100,000	81,861,000
Total Loans, Prior	350,315,000	277,003,000
Revolving Loans Amortized Cost Basis	80,830,000	76,688,000
Total	1,055,485,000	1,022,431,000
Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	57,899,000	171,327,000
Total Loans, Fiscal Year Before Latest Fiscal Year	162,418,000	113,922,000
Total Loans, Two Years Before Latest Fiscal Year	108,648,000	167,103,000
Total Loans, Three Years Before Latest Fiscal Year	164,171,000	130,222,000
Total Loans, Four Years Before Latest Fiscal Year	126,788,000	80,456,000
Total Loans, Prior	337,927,000	265,868,000
Revolving Loans Amortized Cost Basis	77,913,000	73,768,000
Total	1,035,764,000	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	283,000
Total Loans, Four Years Before Latest Fiscal Year	216,000
Total Loans, Prior	3,033,000	3,154,000
Revolving Loans Amortized Cost Basis	163,000	164,000
Total	3,699,000	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	271,000	429,000
Total Loans, Three Years Before Latest Fiscal Year	411,000	3,172,000
Total Loans, Four Years Before Latest Fiscal Year	3,096,000	1,405,000
Total Loans, Prior	9,355,000	7,981,000
Revolving Loans Amortized Cost Basis	2,754,000	2,756,000
Total	16,022,000	16,155,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	731,156,000	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	25,605,000	102,913,000
Total Loans, Fiscal Year Before Latest Fiscal Year	101,567,000	74,242,000
Total Loans, Two Years Before Latest Fiscal Year	73,057,000	122,143,000
Total Loans, Three Years Before Latest Fiscal Year	120,718,000	107,181,000
Total Loans, Four Years Before Latest Fiscal Year	105,626,000	62,346,000
Total Loans, Prior	282,862,000	226,821,000
Revolving Loans Amortized Cost Basis	21,721,000	21,229,000
Total	731,156,000	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	25,605,000	102,773,000
Total Loans, Fiscal Year Before Latest Fiscal Year	101,428,000	74,242,000
Total Loans, Two Years Before Latest Fiscal Year	73,057,000	121,881,000
Total Loans, Three Years Before Latest Fiscal Year	120,459,000	104,720,000
Total Loans, Four Years Before Latest Fiscal Year	103,005,000	60,941,000
Total Loans, Prior	272,174,000	217,435,000
Revolving Loans Amortized Cost Basis	21,321,000	20,829,000
Total	717,049,000	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	259,000
Total Loans, Four Years Before Latest Fiscal Year	183,000
Total Loans, Prior	2,075,000	2,148,000
Total	2,521,000	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	2,438,000	1,405,000
Total Loans, Prior	8,613,000	7,238,000
Revolving Loans Amortized Cost Basis	400,000	400,000
Total	11,586,000	11,639,000
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	63,213,000	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	915,000	6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year	6,232,000	3,756,000
Total Loans, Two Years Before Latest Fiscal Year	3,764,000	12,036,000
Total Loans, Three Years Before Latest Fiscal Year	11,921,000	3,960,000
Total Loans, Four Years Before Latest Fiscal Year	3,904,000	7,148,000
Total Loans, Prior	35,924,000	29,811,000
Revolving Loans Amortized Cost Basis	553,000	520,000
Total	63,213,000	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	915,000	6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year	6,232,000	3,756,000
Total Loans, Two Years Before Latest Fiscal Year	3,764,000	12,036,000
Total Loans, Three Years Before Latest Fiscal Year	11,921,000	3,960,000
Total Loans, Four Years Before Latest Fiscal Year	3,904,000	7,148,000
Total Loans, Prior	35,315,000	29,038,000
Revolving Loans Amortized Cost Basis	371,000	336,000
Total	62,422,000	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	609,000	773,000
Revolving Loans Amortized Cost Basis	150,000	150,000
Total	759,000	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	32,000	34,000
Total	32,000	34,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	233,479,000	211,991,000
Commercial Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	31,152,000	57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year	51,113,000	34,365,000
Total Loans, Two Years Before Latest Fiscal Year	30,426,000	29,919,000
Total Loans, Three Years Before Latest Fiscal Year	28,738,000	19,874,000
Total Loans, Four Years Before Latest Fiscal Year	18,335,000	10,233,000
Total Loans, Prior	25,368,000	15,891,000
Revolving Loans Amortized Cost Basis	48,347,000	43,770,000
Total	233,479,000	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	31,152,000	57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year	51,113,000	34,088,000
Total Loans, Two Years Before Latest Fiscal Year	30,155,000	29,465,000
Total Loans, Three Years Before Latest Fiscal Year	28,303,000	19,163,000
Total Loans, Four Years Before Latest Fiscal Year	17,644,000	10,233,000
Total Loans, Prior	24,397,000	15,042,000
Revolving Loans Amortized Cost Basis	47,484,000	42,906,000
Total	230,248,000	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	24,000
Total Loans, Four Years Before Latest Fiscal Year	33,000
Total Loans, Prior	229,000	106,000
Revolving Loans Amortized Cost Basis	13,000	14,000
Total	299,000	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	271,000	429,000
Total Loans, Three Years Before Latest Fiscal Year	411,000	711,000
Total Loans, Four Years Before Latest Fiscal Year	658,000
Total Loans, Prior	742,000	743,000
Revolving Loans Amortized Cost Basis	850,000	850,000
Total	2,932,000	3,010,000
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	27,637,000	30,077,000
Other Agricultural Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	227,000	4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year	3,645,000	1,836,000
Total Loans, Two Years Before Latest Fiscal Year	1,672,000	3,721,000
Total Loans, Three Years Before Latest Fiscal Year	3,488,000	2,379,000
Total Loans, Four Years Before Latest Fiscal Year	2,235,000	2,134,000
Total Loans, Prior	6,161,000	4,480,000
Revolving Loans Amortized Cost Basis	10,209,000	11,169,000
Total	27,637,000	30,077,000
Current period gross charge-offs, Prior	38,000
Current period gross charge-offs, Total	38,000
Other Agricultural Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	227,000	4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year	3,645,000	1,836,000
Total Loans, Two Years Before Latest Fiscal Year	1,672,000	3,721,000
Total Loans, Three Years Before Latest Fiscal Year	3,488,000	2,379,000
Total Loans, Four Years Before Latest Fiscal Year	2,235,000	2,134,000
Total Loans, Prior	6,041,000	4,353,000
Revolving Loans Amortized Cost Basis	8,737,000	9,697,000
Total	26,045,000	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	120,000	127,000
Total	120,000	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	1,472,000	1,472,000
Total	$ 1,472,000	$ 1,472,000

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