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Investment Securities (Unrealized Position - Less than 12 Mos., 12 Mos. or Longer) (Details 4)
$ in Thousands
Mar. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value $ 152,400 $ 261,265
Less Than 12 Months, Gross Unrealized Losses (463) (1,264)
12 Months or Longer, Fair Value 940,848 1,045,677
12 Months or Longer, Gross Unrealized Losses (16,877) (22,177)
Total Fair Value 1,093,248 1,306,942
Total Gross Unrealized Losses (17,340) (23,441)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 921 131,631
Less Than 12 Months, Gross Unrealized Losses (1) (343)
12 Months or Longer, Fair Value 2,264,102 2,484,212
12 Months or Longer, Gross Unrealized Losses (50,969) (79,714)
Total Fair Value 2,265,023 2,615,843
Total Gross Unrealized Losses $ (50,970) (80,057)
Number of Investment Securities in an Unrealized Loss Position | security 392  
Debt Securities Issued by the U.S. Treasury and Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value $ 19,783 157,058
Less Than 12 Months, Gross Unrealized Losses (80) (964)
12 Months or Longer, Fair Value 290,176 173,763
12 Months or Longer, Gross Unrealized Losses (2,435) (1,613)
Total Fair Value 309,959 330,821
Total Gross Unrealized Losses (2,515) (2,577)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 0 99,440
Less Than 12 Months, Gross Unrealized Losses 0 (237)
12 Months or Longer, Fair Value 129,299 134,239
12 Months or Longer, Gross Unrealized Losses (603) (856)
Total Fair Value 129,299 233,679
Total Gross Unrealized Losses (603) (1,093)
Debt Securities Issued by States and Political Subdivisions    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 0 38,138
Less Than 12 Months, Gross Unrealized Losses 0 (59)
12 Months or Longer, Fair Value 7,314 156,772
12 Months or Longer, Gross Unrealized Losses (11) (972)
Total Fair Value 7,314 194,910
Total Gross Unrealized Losses (11) (1,031)
Debt Securities Issued by Government-Sponsored Enterprises    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 75  
Less Than 12 Months, Gross Unrealized Losses 0  
12 Months or Longer, Fair Value 0  
12 Months or Longer, Gross Unrealized Losses 0  
Total Fair Value 75  
Total Gross Unrealized Losses 0  
Debt Securities Issued by Corporations    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 0 59,770
Less Than 12 Months, Gross Unrealized Losses 0 (231)
12 Months or Longer, Fair Value 163,923 163,371
12 Months or Longer, Gross Unrealized Losses (1,074) (1,626)
Total Fair Value 163,923 223,141
Total Gross Unrealized Losses (1,074) (1,857)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 72,951 95,511
12 Months or Longer, Gross Unrealized Losses (1,306) (1,755)
Total Fair Value 72,951 95,511
Total Gross Unrealized Losses (1,306) (1,755)
Residential - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 119,098 6,299
Less Than 12 Months, Gross Unrealized Losses (354) (10)
12 Months or Longer, Fair Value 17,720 19,011
12 Months or Longer, Gross Unrealized Losses (842) (919)
Total Fair Value 136,818 25,310
Total Gross Unrealized Losses (1,196) (929)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 921 12,974
Less Than 12 Months, Gross Unrealized Losses (1) (45)
12 Months or Longer, Fair Value 1,368,236 1,491,747
12 Months or Longer, Gross Unrealized Losses (32,070) (51,728)
Total Fair Value 1,369,157 1,504,721
Total Gross Unrealized Losses (32,071) (51,773)
Residential - U.S. Government-Sponsored Enterprises    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 13,444 0
Less Than 12 Months, Gross Unrealized Losses (29) 0
12 Months or Longer, Fair Value 403,072 473,380
12 Months or Longer, Gross Unrealized Losses (8,562) (12,563)
Total Fair Value 416,516 473,380
Total Gross Unrealized Losses (8,591) (12,563)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 550,564 617,000
12 Months or Longer, Gross Unrealized Losses (11,013) (20,259)
Total Fair Value 550,564 617,000
Total Gross Unrealized Losses (11,013) (20,259)
Commercial - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 58,643 59,380
12 Months or Longer, Gross Unrealized Losses (3,953) (4,484)
Total Fair Value 58,643 59,380
Total Gross Unrealized Losses (3,953) (4,484)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 0 19,217
Less Than 12 Months, Gross Unrealized Losses 0 (61)
12 Months or Longer, Fair Value 143,052 145,715
12 Months or Longer, Gross Unrealized Losses (5,977) (5,116)
Total Fair Value 143,052 164,932
Total Gross Unrealized Losses (5,977) (5,177)
Mortgage-Backed Securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 132,542 6,299
Less Than 12 Months, Gross Unrealized Losses (383) (10)
12 Months or Longer, Fair Value 479,435 551,771
12 Months or Longer, Gross Unrealized Losses (13,357) (17,966)
Total Fair Value 611,977 558,070
Total Gross Unrealized Losses (13,740) (17,976)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 921 32,191
Less Than 12 Months, Gross Unrealized Losses (1) (106)
12 Months or Longer, Fair Value 2,061,852 2,254,462
12 Months or Longer, Gross Unrealized Losses (49,060) (77,103)
Total Fair Value 2,062,773 2,286,653
Total Gross Unrealized Losses $ (49,061) $ (77,209)