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Schedule of Actual Capital Amounts and Ratios and Selected Minimum Regulatory Thresholds (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Total risk-based capital:    
Actual Amount $ 957,008 $ 974,488
Actual Ratio 14.94% 15.13%
Well Capitalized Amount $ 640,626 $ 643,876
Well Capitalized Ratio 10.00% 10.00%
Tier 1 risk-based capital:    
Actual Amount $ 880,777 $ 894,273
Actual Ratio 13.75% 13.89%
Well Capitalized Amount $ 512,501 $ 515,101
Well Capitalized Ratio 8.00% 8.00%
Common equity tier one risk-based capital:    
Actual Amount $ 800,777 $ 814,273
Actual Ratio 12.50% 12.65%
Leverage capital ratio:    
Actual Amount $ 880,777 $ 894,273
Actual Ratio 10.09% 10.11%
Adequately Capitalized Amount $ 349,244 $ 353,838
Adequately Capitalized Ratio 4.00% 4.00%
Well Capitalized Amount $ 436,555 $ 442,297
Well Capitalized Ratio 5.00% 5.00%
Capital Required for Capital Adequacy under Basel III Phase-in Schedule $ 592,579 $ 555,665
Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets 9.25% 8.63%
Capital Required for Capital Adequacy under Basel III Fully Phased-in $ 672,658 $ 676,070
Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets 10.50% 10.50%
Tier One Risk Based Capital under Basel III Phase-in Schedule $ 464,454 $ 426,890
Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets 7.25% 6.63%
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in $ 544,532 $ 547,295
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets 8.50% 8.50%
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule $ 368,360 $ 330,308
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets 5.75% 5.13%
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in $ 448,438 $ 450,713
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets 7.00% 7.00%
Common Equity Tier One Capital to be Well Capitalized $ 416,407 $ 418,519
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%
FIB    
Total risk-based capital:    
Actual Amount $ 861,953 $ 841,967
Actual Ratio 13.52% 13.13%
Well Capitalized Amount $ 637,759 $ 641,320
Well Capitalized Ratio 10.00% 10.00%
Tier 1 risk-based capital:    
Actual Amount $ 785,722 $ 765,753
Actual Ratio 12.32% 11.94%
Well Capitalized Amount $ 510,207 $ 513,056
Well Capitalized Ratio 8.00% 8.00%
Common equity tier one risk-based capital:    
Actual Amount $ 785,722 $ 765,753
Actual Ratio 12.32% 11.94%
Leverage capital ratio:    
Actual Amount $ 785,722 $ 765,753
Actual Ratio 9.02% 8.69%
Adequately Capitalized Amount $ 348,525 $ 352,283
Adequately Capitalized Ratio 4.00% 4.00%
Well Capitalized Amount $ 435,656 $ 440,353
Well Capitalized Ratio 5.00% 5.00%
Capital Required for Capital Adequacy under Basel III Phase-in Schedule $ 589,927 $ 553,459
Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets 9.25% 8.63%
Capital Required for Capital Adequacy under Basel III Fully Phased-in $ 669,646 $ 673,386
Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets 10.50% 10.50%
Tier One Risk Based Capital under Basel III Phase-in Schedule $ 462,375 $ 425,195
Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets 7.25% 6.63%
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in $ 542,095 $ 545,122
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets 8.50% 8.50%
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule $ 366,711 $ 328,997
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets 5.75% 5.13%
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in $ 446,431 $ 448,924
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets 7.00% 7.00%
Common Equity Tier One Capital to be Well Capitalized $ 414,543 $ 416,858
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%