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Long-term Borrowings - Long-term Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt instrument    
Long-term borrowings $ 1,449,472 $ 1,249,449
Hedged related basis adjustment (4,165) (2,157)
FHLB advances, amount prepayable 1,100,000  
Federal Home Loan Bank advances    
Debt instrument    
Long-term borrowings 1,100,000 875,000
Federal Home Loan Bank advances | TCF Bank    
Debt instrument    
Loans pledged as collateral 4,300,000  
Federal Home Loan Bank advances | Maturity Year 2019    
Debt instrument    
Long-term borrowings $ 0 $ 600,000
Stated Rate 0.00%  
Federal Home Loan Bank advances | Maturity Year 2019 | Minimum    
Debt instrument    
Stated Rate   1.40%
Federal Home Loan Bank advances | Maturity Year 2019 | Maximum    
Debt instrument    
Stated Rate   1.75%
Federal Home Loan Bank advances | Maturity Year 2020    
Debt instrument    
Long-term borrowings $ 1,100,000 $ 275,000
Federal Home Loan Bank advances | Maturity Year 2020 | Minimum    
Debt instrument    
Stated Rate 2.55% 1.76%
Federal Home Loan Bank advances | Maturity Year 2020 | Maximum    
Debt instrument    
Stated Rate 2.79% 1.78%
Subordinated bank notes    
Debt instrument    
Long-term borrowings $ 253,391 $ 254,962
Subordinated bank notes | Maturity Year 2022    
Debt instrument    
Long-term borrowings $ 109,095 $ 108,867
Stated Rate 6.25% 6.25%
Subordinated bank notes | Maturity Year 2025    
Debt instrument    
Long-term borrowings $ 148,461 $ 148,252
Stated Rate 4.60% 4.60%
Subordinated bank notes | Maturity Year 2025, Interest Rate Swap    
Debt instrument    
Hedged related basis adjustment [1] $ (4,165) $ (2,157)
Discounted lease rentals    
Debt instrument    
Long-term borrowings 92,976 119,487
Discounted lease rentals | Maturity Year 2018    
Debt instrument    
Long-term borrowings $ 0 $ 52,347
Stated Rate 0.00%  
Discounted lease rentals | Maturity Year 2018 | Minimum    
Debt instrument    
Stated Rate   2.55%
Discounted lease rentals | Maturity Year 2018 | Maximum    
Debt instrument    
Stated Rate   7.95%
Discounted lease rentals | Maturity Year 2019    
Debt instrument    
Long-term borrowings $ 41,605 $ 34,978
Discounted lease rentals | Maturity Year 2019 | Minimum    
Debt instrument    
Stated Rate 2.53% 2.53%
Discounted lease rentals | Maturity Year 2019 | Maximum    
Debt instrument    
Stated Rate 6.00% 6.00%
Discounted lease rentals | Maturity Year 2020    
Debt instrument    
Long-term borrowings $ 28,258 $ 19,736
Discounted lease rentals | Maturity Year 2020 | Minimum    
Debt instrument    
Stated Rate 2.64% 2.64%
Discounted lease rentals | Maturity Year 2020 | Maximum    
Debt instrument    
Stated Rate 6.50% 6.50%
Discounted lease rentals | Maturity Year 2021    
Debt instrument    
Long-term borrowings $ 16,781 $ 10,077
Discounted lease rentals | Maturity Year 2021 | Minimum    
Debt instrument    
Stated Rate 2.88% 2.88%
Discounted lease rentals | Maturity Year 2021 | Maximum    
Debt instrument    
Stated Rate 5.82% 5.00%
Discounted lease rentals | Maturity Year 2022    
Debt instrument    
Long-term borrowings $ 5,765 $ 2,349
Discounted lease rentals | Maturity Year 2022 | Minimum    
Debt instrument    
Stated Rate 3.04% 3.04%
Discounted lease rentals | Maturity Year 2022 | Maximum    
Debt instrument    
Stated Rate 5.95% 5.43%
Discounted lease rentals | Maturity Year 2023    
Debt instrument    
Long-term borrowings $ 567 $ 0
Stated Rate   0.00%
Discounted lease rentals | Maturity Year 2023 | Minimum    
Debt instrument    
Stated Rate 4.89%  
Discounted lease rentals | Maturity Year 2023 | Maximum    
Debt instrument    
Stated Rate 6.07%  
Capital lease obligation    
Debt instrument    
Long-term borrowings $ 3,105 $ 0
Capital lease obligation | Maturity Year 2019    
Debt instrument    
Long-term borrowings $ 67 $ 0
Stated Rate 3.73% 0.00%
Capital lease obligation | Maturity Year 2020    
Debt instrument    
Long-term borrowings $ 86 $ 0
Stated Rate 3.73% 0.00%
Capital lease obligation | Maturity Year 2021    
Debt instrument    
Long-term borrowings $ 89 $ 0
Stated Rate 3.73% 0.00%
Capital lease obligation | Maturity Year 2022    
Debt instrument    
Long-term borrowings $ 93 $ 0
Stated Rate 3.73% 0.00%
Capital lease obligation | Maturity Year 2023    
Debt instrument    
Long-term borrowings $ 105 $ 0
Stated Rate 3.73% 0.00%
Capital lease obligation | Maturity Year 2024 - 2038    
Debt instrument    
Long-term borrowings $ 2,665 $ 0
Stated Rate 3.73% 0.00%
[1] Related to subordinated bank notes with a stated maturity of 2025.