v3.8.0.1
Regulatory Matters - Schedule of Regulatory Standards for Well Capitalized Institutions and Capital Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Tier 1 risk-based capital ratio, Actual Ratio 7.25%  
Total risk-based capital ratio, Actual Ratio 9.25%  
CET1 capital ratio, For Capital Adequacy Purposes Ratio 4.50%  
CET1 leverage ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 6.50%  
FFI    
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
CET1 capital ratio, Actual Amount $ 366,236 $ 285,754
Tier 1 leverage/(core) ratio, Actual Amount 366,236 285,754
Tier 1 risk-based capital ratio, Actual Amount 366,236 285,754
Total risk-based capital ratio, Actual Amount $ 385,236 $ 301,664
CET1 capital ratio, Actual Ratio 11.99% 12.80%
Tier 1 leverage/(core) ratio, Actual Ratio 8.44% 8.76%
Tier 1 risk-based capital ratio, Actual Ratio 11.99% 12.80%
Total risk-based capital ratio, Actual Ratio 12.61% 13.52%
CET1 capital ratio, For Capital Adequacy Purposes Amount $ 137,435 $ 100,432
Tier 1 leverage/(core) ratio, For Capital Adequacy Purposes Amount 173,514 130,525
Tier 1 risk-based capital ratio, For Capital Adequacy Purposes Amount 183,246 133,910
Total risk-based capital ratio, For Capital Adequacy Purposes Amount $ 244,328 $ 178,547
CET1 capital ratio, For Capital Adequacy Purposes Ratio 4.50% 4.50%
Tier 1 leverage/(core) ratio, For Capital Adequacy Purposes Ratio 4.00% 4.00%
Tier 1 risk-based capital ratio, For Capital Adequacy Purposes Ratio 6.00% 6.00%
Total risk-based capital ratio, For Capital Adequacy Purposes Ratio 8.00% 8.00%
FFA    
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
CET1 capital ratio, Actual Amount $ 398,709 $ 272,221
Tier 1 leverage/(core) ratio, Actual Amount 398,709 272,221
Tier 1 risk-based capital ratio, Actual Amount 398,709 272,221
Total risk-based capital ratio, Actual Amount $ 417,709 $ 288,131
CET1 capital ratio, Actual Ratio 13.07% 12.23%
Tier 1 leverage/(core) ratio, Actual Ratio 9.20% 8.36%
Tier 1 risk-based capital ratio, Actual Ratio 13.07% 12.23%
Total risk-based capital ratio, Actual Ratio 13.69% 12.94%
CET1 capital ratio, For Capital Adequacy Purposes Amount $ 137,290 $ 100,166
Tier 1 leverage/(core) ratio, For Capital Adequacy Purposes Amount 173,363 130,305
Tier 1 risk-based capital ratio, For Capital Adequacy Purposes Amount 183,053 133,555
Total risk-based capital ratio, For Capital Adequacy Purposes Amount $ 244,071 $ 178,074
CET1 capital ratio, For Capital Adequacy Purposes Ratio 4.50% 4.50%
Tier 1 leverage/(core) ratio, For Capital Adequacy Purposes Ratio 4.00% 4.00%
Tier 1 risk-based capital ratio, For Capital Adequacy Purposes Ratio 6.00% 6.00%
Total risk-based capital ratio, For Capital Adequacy Purposes Ratio 8.00% 8.00%
CET1 capital ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount $ 198,308 $ 144,685
Tier 1 leverage/(core) ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount 216,703 162,881
Tier 1 risk-based capital ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount 244,071 178,074
Total risk-based capital ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount $ 305,089 $ 222,592
CET1 leverage ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 6.50% 6.50%
Tier 1 leverage/(core) ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00%
Tier 1 risk-based capital ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 8.00% 8.00%
Total risk-based capital ratio, To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00%