v3.26.3
Expense Example
Nov. 13, 2026
USD ($)
FAF Trust MM Prospectus Class A Member | Government Obligations Fund | Government Obligations Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 77
Expense Example, with Redemption, 3 Years 240
Expense Example, with Redemption, 5 Years 417
Expense Example, with Redemption, 10 Years 930
FAF Trust MM Prospectus Class A Member | Retail Prime Obligations Fund | Retail Prime Obligations Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 242
Expense Example, with Redemption, 5 Years 421
Expense Example, with Redemption, 10 Years 941
FAF Trust MM Prospectus Class A Member | Retail Tax Free Obligations Fund | Retail Tax Free Obligations Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 261
Expense Example, with Redemption, 5 Years 462
Expense Example, with Redemption, 10 Years 1,040
FAF Trust MM Prospectus Class A Member | Treasury Obligations Fund | Treasury Obligations Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 240
Expense Example, with Redemption, 5 Years 417
Expense Example, with Redemption, 10 Years 930
FAF Trust MM Prospectus Class A Member | U.S. Treasury Money Market Fund | U.S. Treasury Money Market Fund Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 240
Expense Example, with Redemption, 5 Years 417
Expense Example, with Redemption, 10 Years 930
FAF Trust MM Prospectus Class D Member | Government Obligations Fund | Government Obligations Fund Class D  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 61
Expense Example, with Redemption, 3 Years 192
Expense Example, with Redemption, 5 Years 335
Expense Example, with Redemption, 10 Years 750
FAF Trust MM Prospectus Class D Member | Treasury Obligations Fund | Treasury Obligations Fund Class D  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 61
Expense Example, with Redemption, 3 Years 192
Expense Example, with Redemption, 5 Years 335
Expense Example, with Redemption, 10 Years 750
FAF Trust MM Prospectus Class D Member | U.S. Treasury Money Market Fund | U.S. Treasury Money Market Fund Class D  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 61
Expense Example, with Redemption, 3 Years 192
Expense Example, with Redemption, 5 Years 335
Expense Example, with Redemption, 10 Years 750
FAF Trust MM Prospectus Class P Member | Government Obligations Fund | Government Obligations Fund Class P  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 18
Expense Example, with Redemption, 3 Years 60
Expense Example, with Redemption, 5 Years 106
Expense Example, with Redemption, 10 Years 242
FAF Trust MM Prospectus Class P Member | Treasury Obligations Fund | Treasury Obligations Fund Class P  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 18
Expense Example, with Redemption, 3 Years 60
Expense Example, with Redemption, 5 Years 106
Expense Example, with Redemption, 10 Years 242
FAF Trust MM Prospectus Class T Member | Government Obligations Fund | Government Obligations Fund Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 128
Expense Example, with Redemption, 5 Years 224
Expense Example, with Redemption, 10 Years 505
FAF Trust MM Prospectus Class T Member | Retail Prime Obligations Fund | Retail Prime Obligations Fund Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 133
Expense Example, with Redemption, 5 Years 233
Expense Example, with Redemption, 10 Years 528
FAF Trust MM Prospectus Class T Member | Retail Tax Free Obligations Fund | Retail Tax Free Obligations Fund Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 150
Expense Example, with Redemption, 5 Years 270
Expense Example, with Redemption, 10 Years 619
FAF Trust MM Prospectus Class T Member | Treasury Obligations Fund | Treasury Obligations Fund Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 128
Expense Example, with Redemption, 5 Years 224
Expense Example, with Redemption, 10 Years 505
FAF Trust MM Prospectus Class T Member | U.S. Treasury Money Market Fund | U.S. Treasury Money Market Fund Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 128
Expense Example, with Redemption, 5 Years 224
Expense Example, with Redemption, 10 Years 505
FAF Trust MM Prospectus Class T Member | Institutional Prime Obligations Fund | Institutional Prime Obligations Fund Class T  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 137
Expense Example, with Redemption, 5 Years 242
Expense Example, with Redemption, 10 Years 551
FAF Trust MM Prospectus Class U Member | Government Obligations Fund | Government Obligations Fund Class U  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 12
Expense Example, with Redemption, 3 Years 54
Expense Example, with Redemption, 5 Years 100
Expense Example, with Redemption, 10 Years 236
FAF Trust MM Prospectus Class V Member | Government Obligations Fund | Government Obligations Fund Class V  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 31
Expense Example, with Redemption, 3 Years 97
Expense Example, with Redemption, 5 Years 169
Expense Example, with Redemption, 10 Years 381
FAF Trust MM Prospectus Class V Member | Retail Prime Obligations Fund | Retail Prime Obligations Fund Class V  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 31
Expense Example, with Redemption, 3 Years 101
Expense Example, with Redemption, 5 Years 178
Expense Example, with Redemption, 10 Years 404
FAF Trust MM Prospectus Class V Member | Retail Tax Free Obligations Fund | Retail Tax Free Obligations Fund Class V  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 31
Expense Example, with Redemption, 3 Years 118
Expense Example, with Redemption, 5 Years 214
Expense Example, with Redemption, 10 Years 495
FAF Trust MM Prospectus Class V Member | Treasury Obligations Fund | Treasury Obligations Fund Class V  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 31
Expense Example, with Redemption, 3 Years 97
Expense Example, with Redemption, 5 Years 169
Expense Example, with Redemption, 10 Years 381
FAF Trust MM Prospectus Class V Member | U.S. Treasury Money Market Fund | U.S. Treasury Money Market Fund Class V  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 31
Expense Example, with Redemption, 3 Years 97
Expense Example, with Redemption, 5 Years 169
Expense Example, with Redemption, 10 Years 381
FAF Trust MM Prospectus Class V Member | Institutional Prime Obligations Fund | Institutional Prime Obligations Fund Class V  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 31
Expense Example, with Redemption, 3 Years 105
Expense Example, with Redemption, 5 Years 187
Expense Example, with Redemption, 10 Years 427
FAF Trust MM Prospectus Class X Member | Government Obligations Fund | Government Obligations Fund Class X  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 14
Expense Example, with Redemption, 3 Years 56
Expense Example, with Redemption, 5 Years 102
Expense Example, with Redemption, 10 Years 238
FAF Trust MM Prospectus Class X Member | Retail Prime Obligations Fund | Retail Prime Obligations Fund Class X  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 14
Expense Example, with Redemption, 3 Years 63
Expense Example, with Redemption, 5 Years 116
Expense Example, with Redemption, 10 Years 272
FAF Trust MM Prospectus Class X Member | Treasury Obligations Fund | Treasury Obligations Fund Class X  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 14
Expense Example, with Redemption, 3 Years 56
Expense Example, with Redemption, 5 Years 102
Expense Example, with Redemption, 10 Years 238
FAF Trust MM Prospectus Class X Member | U.S. Treasury Money Market Fund | U.S. Treasury Money Market Fund Class X  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 16
Expense Example, with Redemption, 3 Years 60
Expense Example, with Redemption, 5 Years 109
Expense Example, with Redemption, 10 Years 251
FAF Trust MM Prospectus Class Y Member | Government Obligations Fund | Government Obligations Fund Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 144
Expense Example, with Redemption, 5 Years 252
Expense Example, with Redemption, 10 Years 567
FAF Trust MM Prospectus Class Y Member | Retail Prime Obligations Fund | Retail Prime Obligations Fund Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 149
Expense Example, with Redemption, 5 Years 261
Expense Example, with Redemption, 10 Years 590
FAF Trust MM Prospectus Class Y Member | Retail Tax Free Obligations Fund | Retail Tax Free Obligations Fund Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 166
Expense Example, with Redemption, 5 Years 297
Expense Example, with Redemption, 10 Years 680
FAF Trust MM Prospectus Class Y Member | Treasury Obligations Fund | Treasury Obligations Fund Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 144
Expense Example, with Redemption, 5 Years 252
Expense Example, with Redemption, 10 Years 567
FAF Trust MM Prospectus Class Y Member | U.S. Treasury Money Market Fund | U.S. Treasury Money Market Fund Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 144
Expense Example, with Redemption, 5 Years 252
Expense Example, with Redemption, 10 Years 567
FAF Trust MM Prospectus Class Y Member | Institutional Prime Obligations Fund | Institutional Prime Obligations Fund Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 153
Expense Example, with Redemption, 5 Years 270
Expense Example, with Redemption, 10 Years 612
FAF Trust MM Prospectus Class Z Member | Government Obligations Fund | Government Obligations Fund Class Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 18
Expense Example, with Redemption, 3 Years 60
Expense Example, with Redemption, 5 Years 106
Expense Example, with Redemption, 10 Years 242
FAF Trust MM Prospectus Class Z Member | Retail Prime Obligations Fund | Retail Prime Obligations Fund Class Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 20
Expense Example, with Redemption, 3 Years 69
Expense Example, with Redemption, 5 Years 122
Expense Example, with Redemption, 10 Years 278
FAF Trust MM Prospectus Class Z Member | Retail Tax Free Obligations Fund | Retail Tax Free Obligations Fund Class Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 20
Expense Example, with Redemption, 3 Years 86
Expense Example, with Redemption, 5 Years 159
Expense Example, with Redemption, 10 Years 371
FAF Trust MM Prospectus Class Z Member | Treasury Obligations Fund | Treasury Obligations Fund Class Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 18
Expense Example, with Redemption, 3 Years 60
Expense Example, with Redemption, 5 Years 106
Expense Example, with Redemption, 10 Years 242
FAF Trust MM Prospectus Class Z Member | U.S. Treasury Money Market Fund | U.S. Treasury Money Market Fund Class Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 20
Expense Example, with Redemption, 3 Years 64
Expense Example, with Redemption, 5 Years 113
Expense Example, with Redemption, 10 Years 255
FAF Trust MM Prospectus Class Z Member | Institutional Prime Obligations Fund | Institutional Prime Obligations Fund Class Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 20
Expense Example, with Redemption, 3 Years 73
Expense Example, with Redemption, 5 Years 131
Expense Example, with Redemption, 10 Years $ 302