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Fair Value Measurements - Carrying Amounts and Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Investment securities:    
Held-to-maturity $ 627,615 $ 618,672
Level 3 | Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, fair value disclosure 63,478 64,130
Level 3 | Nonrecurring | Impaired loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, fair value disclosure 62,118 63,247
Carrying Amount | Level 2    
Investment securities:    
Held-to-maturity 622,019 623,599
Financial liabilities:    
Time deposits 4,334,669 4,074,248
Collateralized customer deposits 413,199 382,687
Short-term borrowings 1,740,000 2,035,000
Long-term borrowings 426,035 426,002
Carrying Amount | Level 3    
Investment securities:    
Held-to-maturity 500 500
Net loans 15,213,764 15,159,795
Fair Value | Level 2    
Investment securities:    
Held-to-maturity 627,165 618,232
Financial liabilities:    
Time deposits 4,315,319 4,041,212
Collateralized customer deposits 413,075 382,370
Short-term borrowings 1,739,883 2,034,719
Long-term borrowings 424,613 423,258
Fair Value | Level 3    
Investment securities:    
Held-to-maturity 450 440
Net loans $ 15,084,122 $ 14,907,789