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Investment Securities (Unrealized Position - Less than 12 Mos., 12 Mos. or Longer) (Details 4)
$ in Thousands
Sep. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value $ 234,737 $ 261,265
Less Than 12 Months, Gross Unrealized Losses (1,369) (1,264)
12 Months or Longer, Fair Value 541,902 1,045,677
12 Months or Longer, Gross Unrealized Losses (7,079) (22,177)
Total Fair Value 776,639 1,306,942
Total Gross Unrealized Losses (8,448) (23,441)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 241,162 131,631
Less Than 12 Months, Gross Unrealized Losses (605) (343)
12 Months or Longer, Fair Value 546,039 2,484,212
12 Months or Longer, Gross Unrealized Losses (7,663) (79,714)
Total Fair Value 787,201 2,615,843
Total Gross Unrealized Losses $ (8,268) (80,057)
Number of Investment Securities in an Unrealized Loss Position | security 233  
Debt Securities Issued by the U.S. Treasury and Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value $ 64,180 157,058
Less Than 12 Months, Gross Unrealized Losses (115) (964)
12 Months or Longer, Fair Value 107,800 173,763
12 Months or Longer, Gross Unrealized Losses (1,277) (1,613)
Total Fair Value 171,980 330,821
Total Gross Unrealized Losses (1,392) (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 39,912 134,239
12 Months or Longer, Gross Unrealized Losses (133) (856)
Total Fair Value 39,912 233,679
Total Gross Unrealized Losses (133) (1,093)
Debt Securities Issued by States and Political Subdivisions    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 181 38,138
Less Than 12 Months, Gross Unrealized Losses 0 (59)
12 Months or Longer, Fair Value 468 156,772
12 Months or Longer, Gross Unrealized Losses (1) (972)
Total Fair Value 649 194,910
Total Gross Unrealized Losses (1) (1,031)
Debt Securities Issued by Government-Sponsored Enterprises    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 21,233  
Less Than 12 Months, Gross Unrealized Losses (92)  
12 Months or Longer, Fair Value 0  
12 Months or Longer, Gross Unrealized Losses 0  
Total Fair Value 21,233  
Total Gross Unrealized Losses (92)  
Debt Securities Issued by Corporations    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 25,808 59,770
Less Than 12 Months, Gross Unrealized Losses (581) (231)
12 Months or Longer, Fair Value 114,466 163,371
12 Months or Longer, Gross Unrealized Losses (534) (1,626)
Total Fair Value 140,274 223,141
Total Gross Unrealized Losses (1,115) (1,857)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 4,638 0
Less Than 12 Months, Gross Unrealized Losses (15) 0
12 Months or Longer, Fair Value 10,922 95,511
12 Months or Longer, Gross Unrealized Losses (128) (1,755)
Total Fair Value 15,560 95,511
Total Gross Unrealized Losses (143) (1,755)
Residential - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 62,749 6,299
Less Than 12 Months, Gross Unrealized Losses (173) (10)
12 Months or Longer, Fair Value 182,660 19,011
12 Months or Longer, Gross Unrealized Losses (2,780) (919)
Total Fair Value 245,409 25,310
Total Gross Unrealized Losses (2,953) (929)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 76,076 12,974
Less Than 12 Months, Gross Unrealized Losses (278) (45)
12 Months or Longer, Fair Value 277,116 1,491,747
12 Months or Longer, Gross Unrealized Losses (4,859) (51,728)
Total Fair Value 353,192 1,504,721
Total Gross Unrealized Losses (5,137) (51,773)
Residential - U.S. Government-Sponsored Enterprises    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 60,586 0
Less Than 12 Months, Gross Unrealized Losses (408) 0
12 Months or Longer, Fair Value 82,390 473,380
12 Months or Longer, Gross Unrealized Losses (910) (12,563)
Total Fair Value 142,976 473,380
Total Gross Unrealized Losses (1,318) (12,563)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 160,448 0
Less Than 12 Months, Gross Unrealized Losses (312) 0
12 Months or Longer, Fair Value 165,075 617,000
12 Months or Longer, Gross Unrealized Losses (1,793) (20,259)
Total Fair Value 325,523 617,000
Total Gross Unrealized Losses (2,105) (20,259)
Commercial - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 54,118 59,380
12 Months or Longer, Gross Unrealized Losses (1,577) (4,484)
Total Fair Value 54,118 59,380
Total Gross Unrealized Losses (1,577) (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 53,014 145,715
12 Months or Longer, Gross Unrealized Losses (750) (5,116)
Total Fair Value 53,014 164,932
Total Gross Unrealized Losses (750) (5,177)
Mortgage-Backed Securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 123,335 6,299
Less Than 12 Months, Gross Unrealized Losses (581) (10)
12 Months or Longer, Fair Value 319,168 551,771
12 Months or Longer, Gross Unrealized Losses (5,267) (17,966)
Total Fair Value 442,503 558,070
Total Gross Unrealized Losses (5,848) (17,976)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 236,524 32,191
Less Than 12 Months, Gross Unrealized Losses (590) (106)
12 Months or Longer, Fair Value 495,205 2,254,462
12 Months or Longer, Gross Unrealized Losses (7,402) (77,103)
Total Fair Value 731,729 2,286,653
Total Gross Unrealized Losses $ (7,992) $ (77,209)