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Fair value of financial instruments (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Fair value of financial instruments [Line Items]    
Cash and cash equivalent $ 672,048 $ 1,069,538
Acceptances 6,369 19,387
Interest receivable 30,872 44,187
Securities at amortized cost [1] 68,934 77,214
Loans, net [2] 5,419,379 5,907,494
Deposits 2,928,844 2,802,852
Acceptances 6,369 19,387
Interest payable 15,816 16,603
Short-term borrowings and debt 1,072,723 1,470,075
Long-term borrowings and debt 1,138,844 1,776,738
Not measured at fair value in statement of financial position but for which fair value is disclosed [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Cash and cash equivalent 672,048 1,069,538
Acceptances 6,369 19,387
Interest receivable 30,872 44,187
Securities at amortized cost [1] 69,006 76,406
Loans, net [2] 5,520,604 6,021,006
Deposits 2,928,844 2,802,852
Acceptances 6,369 19,387
Interest payable 15,816 16,603
Short-term borrowings and debt 1,072,483 1,470,045
Long-term borrowings and debt 1,158,534 1,808,228
Level 1 of fair value hierarchy [member] | Not measured at fair value in statement of financial position but for which fair value is disclosed [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Cash and cash equivalent [3] 0 0
Acceptances [3] 0 0
Interest receivable [3] 0 0
Securities at amortized cost [1],[3] 50,581 73,406
Loans, net [2],[3] 0 0
Deposits [3] 0 0
Acceptances [3] 0 0
Interest payable [3] 0 0
Short-term borrowings and debt [3] 0 0
Long-term borrowings and debt [3] 0 0
Level 2 of fair value hierarchy [member] | Not measured at fair value in statement of financial position but for which fair value is disclosed [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Cash and cash equivalent [4] 672,048 1,069,538
Acceptances [4] 6,369 19,387
Interest receivable [4] 30,872 44,187
Securities at amortized cost [1],[4] 8,447 3,000
Loans, net [2],[4] 5,520,604 6,021,006
Deposits [4] 2,928,844 2,802,852
Acceptances [4] 6,369 19,387
Interest payable [4] 15,816 16,603
Short-term borrowings and debt [4] 1,072,483 1,470,045
Long-term borrowings and debt [4] 1,158,534 1,808,228
Level 3 of fair value hierarchy [member] | Not measured at fair value in statement of financial position but for which fair value is disclosed [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Cash and cash equivalent [5] 0 0
Acceptances [5] 0 0
Interest receivable [5] 0 0
Securities at amortized cost [1],[5] 9,978 0
Loans, net [2],[5] 0 0
Deposits [5] 0 0
Acceptances [5] 0 0
Interest payable [5] 0 0
Short-term borrowings and debt [5] 0 0
Long-term borrowings and debt [5] $ 0 $ 0
[1] The carrying value of securities at amortized cost is net of the allowance for expected credit losses of $0.2 million for December 31, 2017 and $0.6 million for December 31, 2016.
[2] The carrying value of loans at amortized cost is net of the allowance for expected credit losses of $81.3 million and unearned interest and deferred fees of $5.0 million for December 31, 2017; allowance for expected credit losses of $106.0 million and unearned interest and deferred fees of $7.2 million for December 31, 2016.
[3] Level 1: Quoted market prices in an active market.
[4] Level 2: Quoted market prices in an inactive market or internally developed models with significant observable market.
[5] Level 3: Internally developed models with significant unobservable market information.