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Investment Securities - Gross unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Investment securities available-for-sale    
Unrealized losses less than 12 months $ (995) $ (19,761)
Fair value less than 12 months 10,274 178,719
Unrealized losses over 12 months (135,968) (112,503)
Fair value over 12 months 664,644 535,024
Total Unrealized losses (136,963) (132,264)
Total Fair value 674,918 713,743
Held-to-maturity investment securities    
Unrealized losses less than 12 months   (3,336)
Fair value less than 12 months   18,788
Unrealized losses over 12 months   (47,654)
Fair value over 12 months   249,623
Total Unrealized losses   (50,990)
Total Fair value   268,411
Unrealized losses less than 12 months   (23,097)
Fair value less than 12 months   197,507
Unrealized losses over 12 months   (160,157)
Fair value over 12 months   784,647
Total Unrealized losses   (183,254)
Total Fair value   982,154
U. S. Treasury and agencies    
Investment securities available-for-sale    
Unrealized losses less than 12 months (20) (17)
Fair value less than 12 months 420 509
Total Unrealized losses (20) (17)
Total Fair value 420 509
Mortgage backed securities - Residential agency    
Investment securities available-for-sale    
Unrealized losses less than 12 months (76) (10,457)
Fair value less than 12 months 2,148 79,693
Unrealized losses over 12 months (115,055) (107,711)
Fair value over 12 months 556,258 507,418
Total Unrealized losses (115,131) (118,168)
Total Fair value 558,406 587,111
Held-to-maturity investment securities    
Unrealized losses over 12 months   (33,254)
Fair value over 12 months   150,861
Total Unrealized losses   (33,254)
Total Fair value   150,861
Mortgage backed securities - Commercial    
Investment securities available-for-sale    
Unrealized losses less than 12 months (32) (4,835)
Fair value less than 12 months 570 50,437
Unrealized losses over 12 months (7,438) (2,276)
Fair value over 12 months 60,339 13,120
Total Unrealized losses (7,470) (7,111)
Total Fair value 60,909 63,557
Asset backed securities    
Investment securities available-for-sale    
Fair value less than 12 months 27 32
Fair value over 12 months 1 2
Total Fair value 28 34
Corporate bonds    
Investment securities available-for-sale    
Unrealized losses less than 12 months (867) (4,452)
Fair value less than 12 months 7,109 48,048
Unrealized losses over 12 months (13,475) (2,516)
Fair value over 12 months 48,046 14,484
Total Unrealized losses (14,342) (6,968)
Total Fair value $ 55,155 62,532
Obligations of state and political agencies.    
Held-to-maturity investment securities    
Unrealized losses less than 12 months   (3,336)
Fair value less than 12 months   18,788
Unrealized losses over 12 months   (14,400)
Fair value over 12 months   98,762
Total Unrealized losses   (17,736)
Total Fair value   $ 117,550