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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Loans held-for-sale $ 221,784 $ 91,202
Derivative assets 263,349 106,102
Liabilities    
Derivative liabilities 19,256 9,203
Interest rate contracts    
Assets    
Derivative assets 248,267 102,401
Liabilities    
Derivative liabilities 14,681 5,549
Risk participation agreements    
Assets    
Derivative assets 62 202
Liabilities    
Derivative liabilities 125 354
Forward foreign exchange contracts    
Assets    
Derivative assets 0  
Liabilities    
Derivative liabilities 617 2,305
Interest rate lock commitments    
Assets    
Derivative assets 14,561 2,765
Liabilities    
Derivative liabilities 0 13
Forward loan sales commitments    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 3,374 248
Power Equity CDs    
Assets    
Derivative assets 459 734
Liabilities    
Derivative liabilities 459 734
Measurement of fair value on a recurring basis    
Assets    
Investment securities available-for-sale 8,284,723 6,720,001
Loans held-for-sale 221,784 91,202
Interest-only strips 7,823 12,813
Derivative assets 263,401 106,642
Forward loan sales commitments, non-derivative   46
Assets held in trust for deferred compensation plans 48,659 43,743
Total non-recurring fair value measurements 8,826,390 6,974,447
Liabilities    
Derivative liabilities 21,132 14,312
Liabilities held in trust for deferred compensation plans 48,659 43,743
Total liabilities at fair value 69,791 58,055
Measurement of fair value on a recurring basis | Interest rate contracts    
Assets    
Derivative assets 248,267 102,893
Liabilities    
Derivative liabilities 14,681 6,040
Measurement of fair value on a recurring basis | Risk participation agreements    
Assets    
Derivative assets 62 202
Liabilities    
Derivative liabilities 125 354
Measurement of fair value on a recurring basis | Forward foreign exchange contracts    
Assets    
Derivative assets 11  
Liabilities    
Derivative liabilities 2,386 6,519
Measurement of fair value on a recurring basis | Interest rate lock commitments    
Assets    
Derivative assets 14,565 2,772
Liabilities    
Derivative liabilities 4 20
Measurement of fair value on a recurring basis | Forward loan sales commitments    
Assets    
Derivative assets 37 41
Liabilities    
Derivative liabilities 3,411 289
Measurement of fair value on a recurring basis | Power Equity CDs    
Assets    
Derivative assets 459 734
Liabilities    
Derivative liabilities 459 734
Measurement of fair value on a recurring basis | Swap agreement    
Liabilities    
Derivative liabilities 66 356
Measurement of fair value on a recurring basis | Level 1    
Assets    
Investment securities available-for-sale 0 0
Loans held-for-sale 0 0
Interest-only strips 0 0
Derivative assets 0 0
Forward loan sales commitments, non-derivative   0
Assets held in trust for deferred compensation plans 48,659 43,743
Total non-recurring fair value measurements 48,659 43,743
Liabilities    
Derivative liabilities 0 0
Liabilities held in trust for deferred compensation plans 48,659 43,743
Total liabilities at fair value 48,659 43,743
Measurement of fair value on a recurring basis | Level 1 | Interest rate contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 1 | Risk participation agreements    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 1 | Forward foreign exchange contracts    
Assets    
Derivative assets 0  
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 1 | Interest rate lock commitments    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 1 | Forward loan sales commitments    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 1 | Power Equity CDs    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 1 | Swap agreement    
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 2    
Assets    
Investment securities available-for-sale 8,284,219 6,719,568
Loans held-for-sale 221,784 91,202
Interest-only strips 0 0
Derivative assets 263,401 106,642
Forward loan sales commitments, non-derivative   46
Assets held in trust for deferred compensation plans 0 0
Total non-recurring fair value measurements 8,769,404 6,917,458
Liabilities    
Derivative liabilities 21,066 13,956
Liabilities held in trust for deferred compensation plans 0 0
Total liabilities at fair value 21,066 13,956
Measurement of fair value on a recurring basis | Level 2 | Interest rate contracts    
Assets    
Derivative assets 248,267 102,893
Liabilities    
Derivative liabilities 14,681 6,040
Measurement of fair value on a recurring basis | Level 2 | Risk participation agreements    
Assets    
Derivative assets 62 202
Liabilities    
Derivative liabilities 125 354
Measurement of fair value on a recurring basis | Level 2 | Forward foreign exchange contracts    
Assets    
Derivative assets 11  
Liabilities    
Derivative liabilities 2,386 6,519
Measurement of fair value on a recurring basis | Level 2 | Interest rate lock commitments    
Assets    
Derivative assets 14,565 2,772
Liabilities    
Derivative liabilities 4 20
Measurement of fair value on a recurring basis | Level 2 | Forward loan sales commitments    
Assets    
Derivative assets 37 41
Liabilities    
Derivative liabilities 3,411 289
Measurement of fair value on a recurring basis | Level 2 | Power Equity CDs    
Assets    
Derivative assets 459 734
Liabilities    
Derivative liabilities 459 734
Measurement of fair value on a recurring basis | Level 2 | Swap agreement    
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 3    
Assets    
Investment securities available-for-sale 504 433
Loans held-for-sale 0 0
Interest-only strips 7,823 12,813
Derivative assets 0 0
Forward loan sales commitments, non-derivative   0
Assets held in trust for deferred compensation plans 0 0
Total non-recurring fair value measurements 8,327 13,246
Liabilities    
Derivative liabilities 66 356
Liabilities held in trust for deferred compensation plans 0 0
Total liabilities at fair value 66 356
Measurement of fair value on a recurring basis | Level 3 | Interest rate contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 3 | Risk participation agreements    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 3 | Forward foreign exchange contracts    
Assets    
Derivative assets 0  
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 3 | Interest rate lock commitments    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 3 | Forward loan sales commitments    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 3 | Power Equity CDs    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Measurement of fair value on a recurring basis | Level 3 | Swap agreement    
Liabilities    
Derivative liabilities $ 66 $ 356