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Loans Held for Investment and Allowance for Credit Losses on Loans - Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year $ 1,843,175 $ 2,201,950  
Fiscal year before current fiscal year 1,470,370 1,564,202  
Two years before current fiscal year 1,429,143 1,100,602  
Three years before current fiscal year 822,812 560,696  
Four years before current fiscal year 446,595 416,738  
Prior 737,036 634,924  
Revolving Loans Amortized Cost Basis 1,275,979 1,177,533  
Total Loans 8,025,110 7,656,645 $ 6,943,563
Agriculture [Member]      
Financing Receivable Recorded Investment [Line Items]      
Total Loans 449,190 427,139  
Real Estate [Member]      
Financing Receivable Recorded Investment [Line Items]      
Total Loans 8,025,110 7,656,645  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 129,787 165,315  
Fiscal year before current fiscal year 140,185 209,978  
Two years before current fiscal year 196,142 156,881  
Three years before current fiscal year 151,466 109,088  
Four years before current fiscal year 93,826 99,444  
Prior 196,086 161,330  
Revolving Loans Amortized Cost Basis 24,217 58,908  
Total Loans 931,709 960,944  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 73,928 125,041  
Fiscal year before current fiscal year 97,497 144,429  
Two years before current fiscal year 140,750 124,113  
Three years before current fiscal year 99,998 85,619  
Four years before current fiscal year 70,919 77,400  
Prior 157,286 135,064  
Revolving Loans Amortized Cost Basis 18,517 23,004  
Total Loans 658,895 714,670  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 40,463 39,735  
Fiscal year before current fiscal year 32,521 61,879  
Two years before current fiscal year 51,722 28,506  
Three years before current fiscal year 48,845 22,473  
Four years before current fiscal year 21,767 19,617  
Prior 34,536 24,199  
Revolving Loans Amortized Cost Basis 5,281 33,304  
Total Loans 235,135 229,713  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 13,626 140  
Fiscal year before current fiscal year 9,790 3,580  
Two years before current fiscal year 3,515 4,262  
Three years before current fiscal year 2,575 644  
Four years before current fiscal year 788 1,432  
Prior 1,731 1,051  
Revolving Loans Amortized Cost Basis 297 2,450  
Total Loans 32,322 13,559  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 1,770 399  
Fiscal year before current fiscal year 377 90  
Two years before current fiscal year 155    
Three years before current fiscal year 48 352  
Four years before current fiscal year 352 656  
Prior 2,533 1,016  
Revolving Loans Amortized Cost Basis 122 150  
Total Loans 5,357 2,663  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 5 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Four years before current fiscal year   339  
Total Loans   339  
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 202,878 305,555  
Fiscal year before current fiscal year 392,728 418,917  
Two years before current fiscal year 417,365 253,559  
Three years before current fiscal year 231,628 166,830  
Four years before current fiscal year 135,813 126,369  
Prior 160,018 141,468  
Revolving Loans Amortized Cost Basis 38,053 73,722  
Total Loans 1,578,483 1,486,420  
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 116,295 221,014  
Fiscal year before current fiscal year 285,971 271,637  
Two years before current fiscal year 260,605 172,291  
Three years before current fiscal year 176,082 113,676  
Four years before current fiscal year 107,312 56,831  
Prior 93,834 68,576  
Revolving Loans Amortized Cost Basis 32,071 44,878  
Total Loans 1,072,170 948,903  
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 75,546 82,206  
Fiscal year before current fiscal year 106,628 139,982  
Two years before current fiscal year 144,117 79,204  
Three years before current fiscal year 53,575 53,154  
Four years before current fiscal year 28,429 63,331  
Prior 63,393 72,075  
Revolving Loans Amortized Cost Basis 5,982 28,844  
Total Loans 477,670 518,796  
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 5,133 2,135  
Fiscal year before current fiscal year   6,666  
Two years before current fiscal year 12,643 1,715  
Four years before current fiscal year 72 6,207  
Prior 240 251  
Total Loans 18,088 16,974  
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 5,904 200  
Fiscal year before current fiscal year 129 632  
Two years before current fiscal year   349  
Three years before current fiscal year 1,971    
Prior 2,551 566  
Total Loans 10,555 1,747  
Real Estate [Member] | Construction and Development Less than 60 Months [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 224,861 221,407  
Fiscal year before current fiscal year 202,233 178,831  
Two years before current fiscal year 226,380 94,345  
Three years before current fiscal year 10,629 12,688  
Four years before current fiscal year 10,365 16,798  
Prior 21,160 7,184  
Revolving Loans Amortized Cost Basis 61,034 111,390  
Total Loans 756,662 642,643  
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 127,282 124,218  
Fiscal year before current fiscal year 88,506 133,254  
Two years before current fiscal year 170,192 65,472  
Three years before current fiscal year 8,684 5,828  
Four years before current fiscal year 8,617 3,392  
Prior 7,034 5,019  
Revolving Loans Amortized Cost Basis 29,951 76,831  
Total Loans 440,266 414,014  
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 94,738 95,138  
Fiscal year before current fiscal year 113,585 43,884  
Two years before current fiscal year 55,372 28,772  
Three years before current fiscal year 1,193 6,625  
Four years before current fiscal year 1,544 13,406  
Prior 14,063 2,146  
Revolving Loans Amortized Cost Basis 11,741 34,559  
Total Loans 292,236 224,530  
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 2,790 2,051  
Fiscal year before current fiscal year 84 893  
Two years before current fiscal year   101  
Three years before current fiscal year 554 235  
Four years before current fiscal year 68    
Prior 63 19  
Total Loans 3,559 3,299  
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 51    
Fiscal year before current fiscal year 58 800  
Two years before current fiscal year 816    
Three years before current fiscal year 198    
Four years before current fiscal year 136    
Revolving Loans Amortized Cost Basis 19,342    
Total Loans 20,601 800  
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 199,259 221,463  
Fiscal year before current fiscal year 24,290 10,509  
Two years before current fiscal year 4,837 1,448  
Three years before current fiscal year 79 112  
Four years before current fiscal year 1,288 105  
Prior 518 467  
Revolving Loans Amortized Cost Basis 20,102 49,382  
Total Loans 250,373 283,486  
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 115,070 158,161  
Fiscal year before current fiscal year 20,543 7,551  
Two years before current fiscal year 4,073 1,421  
Three years before current fiscal year 76 100  
Four years before current fiscal year 1,276 105  
Prior 518 467  
Revolving Loans Amortized Cost Basis 4,386 49,284  
Total Loans 145,942 217,089  
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 79,451 57,172  
Fiscal year before current fiscal year 3,630 2,365  
Two years before current fiscal year 558 27  
Three years before current fiscal year 3 12  
Four years before current fiscal year 12    
Revolving Loans Amortized Cost Basis 15,716 98  
Total Loans 99,370 59,674  
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 3,580 5,457  
Fiscal year before current fiscal year   387  
Total Loans 3,580 5,844  
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 1,158 673  
Fiscal year before current fiscal year 117 206  
Two years before current fiscal year 206    
Total Loans 1,481 879  
Real Estate [Member] | Residential Real Estate First Lien [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 358,686 348,916  
Fiscal year before current fiscal year 275,387 268,012  
Two years before current fiscal year 254,291 213,325  
Three years before current fiscal year 189,800 141,217  
Four years before current fiscal year 124,643 86,027  
Prior 221,886 195,200  
Revolving Loans Amortized Cost Basis 6,572 6,047  
Total Loans 1,431,265 1,258,744  
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 270,182 294,363  
Fiscal year before current fiscal year 199,996 226,557  
Two years before current fiscal year 201,208 174,325  
Three years before current fiscal year 148,548 115,055  
Four years before current fiscal year 96,714 71,941  
Prior 171,143 149,836  
Revolving Loans Amortized Cost Basis 5,603 6,047  
Total Loans 1,093,394 1,038,124  
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 81,350 51,619  
Fiscal year before current fiscal year 71,196 39,146  
Two years before current fiscal year 49,965 35,226  
Three years before current fiscal year 36,685 24,738  
Four years before current fiscal year 25,338 12,591  
Prior 43,908 39,264  
Revolving Loans Amortized Cost Basis 969    
Total Loans 309,411 202,584  
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 5,720 2,175  
Fiscal year before current fiscal year 3,399 2,187  
Two years before current fiscal year 2,769 2,630  
Three years before current fiscal year 2,840 773  
Four years before current fiscal year 2,132 1,140  
Prior 4,700 4,009  
Total Loans 21,560 12,914  
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 1,434 759  
Fiscal year before current fiscal year 796 122  
Two years before current fiscal year 349 1,144  
Three years before current fiscal year 1,727 651  
Four years before current fiscal year 459 355  
Prior 2,135 2,091  
Total Loans 6,900 5,122  
Real Estate [Member] | Residential Real Estate All Other [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 48,608 49,193  
Fiscal year before current fiscal year 33,183 30,966  
Two years before current fiscal year 23,530 9,994  
Three years before current fiscal year 6,994 9,814  
Four years before current fiscal year 7,735 5,139  
Prior 14,636 15,834  
Revolving Loans Amortized Cost Basis 140,775 123,756  
Total Loans 275,461 244,696  
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 40,293 44,475  
Fiscal year before current fiscal year 27,885 24,861  
Two years before current fiscal year 19,557 8,381  
Three years before current fiscal year 5,560 8,122  
Four years before current fiscal year 6,348 3,753  
Prior 10,515 12,827  
Revolving Loans Amortized Cost Basis 51,106 46,479  
Total Loans 161,264 148,898  
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 7,508 4,244  
Fiscal year before current fiscal year 4,674 5,819  
Two years before current fiscal year 3,712 1,415  
Three years before current fiscal year 1,261 1,652  
Four years before current fiscal year 1,105 1,308  
Prior 3,529 2,527  
Revolving Loans Amortized Cost Basis 86,860 74,388  
Total Loans 108,649 91,353  
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 630 355  
Fiscal year before current fiscal year 403 262  
Two years before current fiscal year 188 198  
Three years before current fiscal year 173 40  
Four years before current fiscal year 232 23  
Prior 575 391  
Revolving Loans Amortized Cost Basis 1,863 1,942  
Total Loans 4,064 3,211  
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 177 119  
Fiscal year before current fiscal year 221 24  
Two years before current fiscal year 73    
Four years before current fiscal year 50 55  
Prior 17 89  
Revolving Loans Amortized Cost Basis 946 947  
Total Loans 1,484 1,234  
Real Estate [Member] | Agriculture [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 88,117 91,544  
Fiscal year before current fiscal year 67,329 73,848  
Two years before current fiscal year 60,494 53,929  
Three years before current fiscal year 42,820 39,130  
Four years before current fiscal year 31,454 26,736  
Prior 61,028 51,498  
Revolving Loans Amortized Cost Basis 97,948 90,454  
Total Loans 449,190 427,139  
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 44,952 52,934  
Fiscal year before current fiscal year 41,620 51,099  
Two years before current fiscal year 39,866 34,840  
Three years before current fiscal year 27,901 26,603  
Four years before current fiscal year 19,849 17,863  
Prior 41,401 33,052  
Revolving Loans Amortized Cost Basis 52,243 46,981  
Total Loans 267,832 263,372  
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 38,600 28,829  
Fiscal year before current fiscal year 22,924 20,931  
Two years before current fiscal year 18,639 18,245  
Three years before current fiscal year 13,097 9,826  
Four years before current fiscal year 9,043 8,207  
Prior 17,434 15,833  
Revolving Loans Amortized Cost Basis 38,508 41,018  
Total Loans 158,245 142,889  
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 1,765 9,516  
Fiscal year before current fiscal year 1,702 1,185  
Two years before current fiscal year 1,212 789  
Three years before current fiscal year 1,666 2,570  
Four years before current fiscal year 2,489 296  
Prior 1,958 2,372  
Revolving Loans Amortized Cost Basis 7,061 2,454  
Total Loans 17,853 19,182  
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 2,800 265  
Fiscal year before current fiscal year 1,083 633  
Two years before current fiscal year 777 55  
Three years before current fiscal year 156 131  
Four years before current fiscal year 73 370  
Prior 235 241  
Revolving Loans Amortized Cost Basis 136 1  
Total Loans 5,260 1,696  
Commercial Non-real Estate [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 261,487 351,089  
Fiscal year before current fiscal year 185,757 216,257  
Two years before current fiscal year 170,679 180,400  
Three years before current fiscal year 133,039 46,483  
Four years before current fiscal year 27,798 44,266  
Prior 53,916 42,213  
Revolving Loans Amortized Cost Basis 530,786 408,744  
Total Loans 1,363,462 1,289,452  
Commercial Non-real Estate [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 154,831 252,112  
Fiscal year before current fiscal year 105,332 176,013  
Two years before current fiscal year 138,536 159,470  
Three years before current fiscal year 114,365 39,097  
Four years before current fiscal year 23,278 36,907  
Prior 47,272 33,824  
Revolving Loans Amortized Cost Basis 318,308 277,740  
Total Loans 901,922 975,163  
Commercial Non-real Estate [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 103,737 95,590  
Fiscal year before current fiscal year 76,999 35,955  
Two years before current fiscal year 29,152 19,519  
Three years before current fiscal year 17,882 6,591  
Four years before current fiscal year 4,005 6,456  
Prior 6,016 8,071  
Revolving Loans Amortized Cost Basis 175,832 127,800  
Total Loans 413,623 299,982  
Commercial Non-real Estate [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 1,487 2,206  
Fiscal year before current fiscal year 2,121 2,598  
Two years before current fiscal year 1,944 1,011  
Three years before current fiscal year 438 109  
Four years before current fiscal year 128 121  
Prior 299 164  
Revolving Loans Amortized Cost Basis 36,288 1,779  
Total Loans 42,705 7,988  
Commercial Non-real Estate [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 1,432 1,181  
Fiscal year before current fiscal year 1,305 1,691  
Two years before current fiscal year 976 400  
Three years before current fiscal year 348 686  
Four years before current fiscal year 386 309  
Prior 165 154  
Revolving Loans Amortized Cost Basis 358 1,425  
Total Loans 4,970 5,846  
Commercial Non-real Estate [Member] | Grade 5 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Two years before current fiscal year 71    
Three years before current fiscal year 6    
Four years before current fiscal year 1 473  
Prior 164    
Total Loans 242 473  
Consumer Non-real Estate [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 206,932 231,415  
Fiscal year before current fiscal year 128,983 122,160  
Two years before current fiscal year 66,021 63,184  
Three years before current fiscal year 33,675 21,034  
Four years before current fiscal year 8,553 10,012  
Prior 4,781 4,377  
Revolving Loans Amortized Cost Basis 29,702 24,285  
Total Loans 478,647 476,467  
Consumer Non-real Estate [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 186,539 211,028  
Fiscal year before current fiscal year 111,148 105,365  
Two years before current fiscal year 54,914 55,079  
Three years before current fiscal year 28,236 18,529  
Four years before current fiscal year 7,165 8,939  
Prior 3,662 3,301  
Revolving Loans Amortized Cost Basis 18,479 22,184  
Total Loans 410,143 424,425  
Consumer Non-real Estate [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 18,622 19,085  
Fiscal year before current fiscal year 15,149 14,919  
Two years before current fiscal year 9,285 6,764  
Three years before current fiscal year 4,296 2,062  
Four years before current fiscal year 1,042 702  
Prior 885 910  
Revolving Loans Amortized Cost Basis 11,213 2,085  
Total Loans 60,492 46,527  
Consumer Non-real Estate [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 1,493 941  
Fiscal year before current fiscal year 2,007 1,424  
Two years before current fiscal year 1,279 932  
Three years before current fiscal year 901 326  
Four years before current fiscal year 228 299  
Prior 193 156  
Revolving Loans Amortized Cost Basis 9 11  
Total Loans 6,110 4,089  
Consumer Non-real Estate [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 278 361  
Fiscal year before current fiscal year 677 452  
Two years before current fiscal year 543 409  
Three years before current fiscal year 242 117  
Four years before current fiscal year 118 72  
Prior 41 10  
Revolving Loans Amortized Cost Basis 1 5  
Total Loans 1,900 1,426  
Consumer Non-real Estate [Member] | Grade 5 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Fiscal year before current fiscal year 2    
Total Loans 2    
Oil and Gas [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 122,560 216,053  
Fiscal year before current fiscal year 20,295 34,724  
Two years before current fiscal year 9,404 73,537  
Three years before current fiscal year 22,682 14,300  
Four years before current fiscal year 5,120 1,842  
Prior 3,007 15,353  
Revolving Loans Amortized Cost Basis 326,790 230,845  
Total Loans 509,858 586,654  
Oil and Gas [Member] | Grade 1 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 86,975 147,902  
Fiscal year before current fiscal year 13,037 29,658  
Two years before current fiscal year 4,996 72,127  
Three years before current fiscal year 21,945 13,898  
Four years before current fiscal year 4,762 1,553  
Prior 2,365 15,015  
Revolving Loans Amortized Cost Basis 218,887 180,321  
Total Loans 352,967 460,474  
Oil and Gas [Member] | Grade 2 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 35,299 66,080  
Fiscal year before current fiscal year 7,137 4,851  
Two years before current fiscal year 4,408 1,019  
Three years before current fiscal year 502 402  
Four years before current fiscal year 358 279  
Prior 167 177  
Revolving Loans Amortized Cost Basis 107,428 50,201  
Total Loans 155,299 123,009  
Oil and Gas [Member] | Grade 3 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year 286 1,758  
Fiscal year before current fiscal year 121 132  
Two years before current fiscal year   225  
Three years before current fiscal year 170    
Prior 63    
Revolving Loans Amortized Cost Basis 475 323  
Total Loans 1,115 2,438  
Oil and Gas [Member] | Grade 4 [Member]      
Financing Receivable Recorded Investment [Line Items]      
Current fiscal year   313  
Fiscal year before current fiscal year   83  
Two years before current fiscal year   166  
Three years before current fiscal year 65    
Four years before current fiscal year   10  
Prior 412 161  
Total Loans $ 477 $ 733