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Investment Securities (Contractual Maturities and Narrative) (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity [Abstract]      
Due in One Year or Less $ 57,119    
Due After One Year Through Five Years 613,577    
Due After Five Years Through Ten Years 92,306    
Due After Ten Years 22,830    
Available-for-Sale, Total 785,832    
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]      
Due in One Year or Less 57,094    
Due After One Year Through Five Years 613,408    
Due After Five Years Through Ten Years 94,126    
Due After Ten Years 23,536    
Fair Value, Total 788,164    
Available-for-Sale: Amortized Cost 2,022,158 $ 2,236,144 $ 2,183,943
Available-for-Sale 2,007,942 2,232,979 2,186,041
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturity [Abstract]      
Due in One Year or Less 164,868    
Due After One Year Through Five Years 311,016    
Due After Five Years Through Ten Years 201,389    
Due After Ten Years 7,717    
Amortized Cost, Total 684,990    
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]      
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 164,518    
Due After One Year Through Five Years 312,837    
Due After Five Years Through Ten Years 203,010    
Due After Ten Years 8,113    
Fair Value, Total 688,478    
Held-to-Maturity: Amortized Cost 3,482,092    
Held-to-Maturity: Fair Value 3,413,994 3,894,121 3,827,527
Carrying value of investment securities which were pledged to secure deposits of gov't entities and repos $ 2,300,000 2,400,000 2,400,000
Number of days non-accrual loans and leases are not past due 30 days    
Mortgage-Backed Securities      
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]      
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost $ 842,820    
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value 828,349    
Available-for-Sale: Amortized Cost 842,820 925,062 841,190
Available-for-Sale 828,349 913,919 836,348
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]      
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost 2,797,102    
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value 2,725,516    
Held-to-Maturity: Fair Value 2,725,516 3,154,684 2,909,793
US Government Agencies Debt Securities      
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]      
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost 393,506    
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value 391,429    
Residential - Government Agencies      
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]      
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost 189,645    
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value 190,442    
Available-for-Sale: Amortized Cost 189,645 233,268 240,412
Available-for-Sale 190,442 235,360 243,844
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]      
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost 1,861,874    
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value 1,813,987    
Held-to-Maturity: Fair Value 1,813,987 2,202,913 1,936,782
Residential - U.S. Government Sponsored Enterprises      
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]      
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost 589,311    
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value 578,527    
Available-for-Sale: Amortized Cost 589,311 619,795 511,234
Available-for-Sale 578,527 609,812 506,987
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]      
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost 758,835    
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value 740,166    
Held-to-Maturity: Fair Value 740,166 752,968 742,647
Commercial - Government Agencies      
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]      
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost 63,864    
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value 59,380    
Available-for-Sale: Amortized Cost 63,864 71,999 89,544
Available-for-Sale 59,380 68,747 85,517
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]      
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost 176,393    
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value 171,363    
Held-to-Maturity: Fair Value $ 171,363 $ 198,803 $ 230,364