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Securities - Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity (Details) - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Securities Financing Transaction [Line Items]            
Available-for-sale, amortized cost $ 488,018,000   $ 503,404,000      
Available-for-sale, gross unrealized gains 0   1,000      
Available-for-sale, gross unrealized losses (34,810,000)   (45,757,000)      
Available-for-sale, fair value 453,208,000   457,648,000      
Allowance for Credit Losses 0   0      
Amortized Cost 1,192,166,000   1,224,564,000      
Held-to-maturity, gross unrealized gains 422,000   1,244,000      
Held-to-maturity, gross unrealized losses (145,246,000)   (115,767,000)      
Debt securities held-to-maturity 1,047,342,000   1,110,041,000      
Allowance for Credit Losses (932,000) $ (964,000) (1,128,000) $ (1,234,000) $ (1,293,000) $ (1,467,000)
Total, amortized cost 1,680,184,000   1,727,968,000      
Total, gross unrealized gains 422,000   1,245,000      
Total, gross unrealized losses (180,056,000)   (161,524,000)      
Total, estimated fair value 1,500,550,000   1,567,689,000      
U.S. government and agency obligations            
Securities Financing Transaction [Line Items]            
Available-for-sale, amortized cost 71,895,000   87,648,000      
Available-for-sale, gross unrealized gains 0   1,000      
Available-for-sale, gross unrealized losses (7,815,000)   (7,635,000)      
Available-for-sale, fair value 64,080,000   80,014,000      
Allowance for Credit Losses 0   0      
Corporate debt securities            
Securities Financing Transaction [Line Items]            
Available-for-sale, amortized cost 10,084,000   8,928,000      
Available-for-sale, gross unrealized gains 0   0      
Available-for-sale, gross unrealized losses (1,132,000)   (756,000)      
Available-for-sale, fair value 8,952,000   8,172,000      
Allowance for Credit Losses 0   0      
Amortized Cost 71,430,000   56,893,000      
Held-to-maturity, gross unrealized gains 373,000   380,000      
Held-to-maturity, gross unrealized losses (6,106,000)   (3,778,000)      
Debt securities held-to-maturity 65,697,000   53,495,000      
Allowance for Credit Losses (868,000)   (1,059,000)      
Asset-backed securities            
Securities Financing Transaction [Line Items]            
Available-for-sale, amortized cost 296,212,000   296,222,000      
Available-for-sale, gross unrealized gains 0   0      
Available-for-sale, gross unrealized losses (5,768,000)   (19,349,000)      
Available-for-sale, fair value 290,444,000   276,873,000      
Allowance for Credit Losses 0   0      
Agency residential            
Securities Financing Transaction [Line Items]            
Amortized Cost 787,875,000   849,985,000      
Held-to-maturity, gross unrealized gains 3,000   795,000      
Held-to-maturity, gross unrealized losses (103,865,000)   (83,586,000)      
Debt securities held-to-maturity 684,013,000   767,194,000      
Allowance for Credit Losses 0   0      
Agency commercial            
Securities Financing Transaction [Line Items]            
Available-for-sale, amortized cost 109,827,000   110,606,000      
Available-for-sale, gross unrealized gains 0   0      
Available-for-sale, gross unrealized losses (20,095,000)   (18,017,000)      
Available-for-sale, fair value 89,732,000   92,589,000      
Allowance for Credit Losses 0   0      
Amortized Cost 83,322,000   32,127,000      
Held-to-maturity, gross unrealized gains 16,000   23,000      
Held-to-maturity, gross unrealized losses (6,392,000)   (1,189,000)      
Debt securities held-to-maturity 76,946,000   30,961,000      
Allowance for Credit Losses (16,000)   0      
State, municipal, and sovereign debt obligations            
Securities Financing Transaction [Line Items]            
Amortized Cost 228,779,000   260,249,000      
Held-to-maturity, gross unrealized gains 30,000   46,000      
Held-to-maturity, gross unrealized losses (26,705,000)   (24,940,000)      
Debt securities held-to-maturity 202,104,000   235,355,000      
Allowance for Credit Losses (41,000)   (60,000)      
Non-agency commercial            
Securities Financing Transaction [Line Items]            
Amortized Cost 20,760,000   25,310,000      
Held-to-maturity, gross unrealized gains 0   0      
Held-to-maturity, gross unrealized losses (2,178,000)   (2,274,000)      
Debt securities held-to-maturity 18,582,000   23,036,000      
Allowance for Credit Losses (7,000)   (9,000)      
Total mortgage-backed securities            
Securities Financing Transaction [Line Items]            
Amortized Cost 891,957,000   907,422,000      
Held-to-maturity, gross unrealized gains 19,000   818,000      
Held-to-maturity, gross unrealized losses (112,435,000)   (87,049,000)      
Debt securities held-to-maturity 779,541,000   821,191,000      
Allowance for Credit Losses $ (23,000)   $ (9,000)